Please Tell Me If I'm Being Crazy and Hormonal Here(warning long)

So, I'm 6 weeks pregnant tomorrow and unlike some of you, I announced to close family as soon as I found out. I've had multiple miscarriages and chemicals and was sick of hiding it and leaving people to only experience the good side of pregnancy and fertility. I also feel more confident in this pregnancy because I was put on progesterone this time around and so far I have had great symptoms. I was pregnant 3 years ago and told my family and MIL we told her not to say anything but, she told everyone and their uncle and kept talking about how she was going to be a grandmother. We were scared because we didn't want to have to tell all of those people we miscarried if we did. We forgave her for it and moved on just happy we were pregnant. Long story short I miscarried at 13 weeks and she made it all about her because now she had to deal with the family she went on and told after we posted about our miscarriage on Facebook. She also told me that I needed to suck it up and think about her pain as she lost her grandbaby. As if a grandmother's pain was greater than a mother's. We vowed to never tell her again until after 20 weeks. Fast forward to now with several losses in between and we decided to give her another chance because we were tired of bearing such harsh feelings. We told her and my fil the day we found out. She tried to push us to tell my sil right away but, we waited until after our 3rd blood draw. She has kept it a secret for us this time so we thought it was going to be better this time. My sil came in the day of our 3rd blood draw so we got her a tshirt that said promoted to auntie est. 2020. My sil hugged us and was happy and all went well. She asked our due date and it turned out to be the day before her 4 month old daughter's birthday. Our sil laughed at the coincidence as both her husband and I share the same birthday and we remarked on how cool it would be. My mil suddenly was very icey towards me and anytime I spoke about the pregnancy or our plans for buying a house she would roll her eyes and scoff. She then would give me the silent treatment and ignored me if I tried to join in on the conversation. It went like that the whole night. I bit my tongue and we left after my sil went to bed. My husband and I surmised that my MIL must be pissed that both kiddos will have the same birthday which means her daughter won't get solo attention (my mil has a me me me problem and expects her daughter to have the spotlight at all times as well). We decided to bring her attitude up the next time we see her if she continues to act like that. We saw her today and she was very friendly towards me. I was relieved and chalked it up to her just being in a general bad mood and me just reading into things. Then she watched my husband leave the room and told me my sil (who just birthed a child 4 months ago and works 60 hour weeks and would not be able to afford another child and did not want another child for 3 more years) was now suddenly trying to get pregnant again literally 4 days after my sil just offered me a bunch of baby stuff that is very necessary for a newborn! I was shocked to say the least but, I saw her search my face for a reaction and I knew she was looking for a negative one so I acted happy as I could be for the news. Her face immediately fell and she then rolled her eyes when I mentioned my plans for this pregnancy again after awhile. To me it felt like a spiteful jab. For some preface, my sil has had 3 years with the spotlight only being on her. She had it the first year with being engaged and renovating her dream home. Then she had it the entire first year she was married. Then she had it during her pregnancy. And now she has it with the baby being here. My sil was more than happy for us to have the spotlight for awhile. I'm not usually one for attention but, this could be our only baby with all of our fertility problems and I made it clear that I wanted to make this pregnancy a big deal because of that possibility. We were always supportive of my sil and always happy as could be for her but, this time.....this time I just wanted it to be about us and our baby and life for a change. We are hitting two HUGE milestones at the same time. We are so overjoyed and it really hurt and pissed me off that my MIL would actively tell me something like that which I'm not sure is even true given what my sil had said not 4 days ago. If it is true and my sil actually wants this then I am very very happy for her and would love to be pregnant at the same time but, with the way my MIL has been acting and the me me me complex I feel as if she pushed my sil into this. For reference, when we announced we were going to buy a house my mil immediately started pushing my sil very very hard to buy a new house even though they have a beautiful house with more than enough space. Literally last time my sil was here she was pushing her and I saw that it made my sil feel really terrible and a little annoyed. I just feel like crying. Why can't my MIL just be happy for us and satisfied. Why can't she be supportive. I feel like my one time to shine has been stolen. My stepmother is pregnant right now so my father could care less about my pregnancy and my mother just booked a flight to California for my due date so I know that she doesn't care. I was just hoping that my husband's family would be just as happy for us as they were for my sil. I'm feeling isolated and so does my husband. We don't even want to involve my MIL in the pregnancy anymore but, at the same time, I feel crazy to feel this strongly about another possible pregnancy. It really isn't the pregnancy that bothers me as much as it is my MIL's behavior. I feel like I'm may just be hormonal and reading too far into things but, my husband sees it too but, he may just be being supportive right now for my sake. It took everything in me not to cry in the car. Am I being ridiculous? What should I do about this situation? What is your take on this? Please help.