Sister said I shouldn’t have a second baby yet - no good reason

I’m 30 and have a 7 year old son, my boyfriend and I have been together for close to 2 years and he now lives with me.

My younger sister is pregnant with her first and for ages said how nice it would be if we could have babies of the same age, my and my partner had been discussing for months about trying and decided to go for it. I told my sister and she was happy and supportive then one day sent a long message saying she can’t be fake any longer said it wasn’t an attack and continued with the most opinionated message I’d ever got. She said we should wait, she said that our finances aren’t good ( she doesn’t know our income or outgoings), our house is too small ( we live in a 2 bed house ) said I should get a better job , ( I’ve been in my job for nearly 3 years ) and continued saying we should wait. Again this was her ‘opinion’ she had faked for weeks and now said we should wait.

When she announced she was pregnant me and my boyfriend were so happy for her and she immediately said I think you guys should wait to have a baby a year after us that would be cute.

Me and my boyfriend decided to try sooner as we had discussed it months ago and all of a sudden she is against it happening right now, it’s hard for this not to come across as her wanting all the attention on her and her own pregnancy.

My family never supported me!

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My family said if I left my ex husband that they would support me when I was pregnant and once my baby was born they didn’t help one bit, they never checked in to see how we were doing , they never watched him. I once had a medical emergency and needed to go to hospital but couldn’t because my family refused to help. The first time I ever got time to myself was because I had a breast cancer scare and needed to get tested for it. They never watch my eldest son so I have to pay loads on childcare and when my OCD got bad and I got depressed they told each other not to speak to me and not to help so I shut all of them out of my life, including this sister who is opinionated because I said we should try for a baby.

I explained to her that we can save while the baby is at this home, the bills and rent are cheaper, I’ll get maternity leave from my job where as if I get a new job I wouldn’t, I said we have worked out finances for worst case scenarios I.e if I lost my job and I said we would still be okay. I said all of this and she said that she is still against it and that she can’t continue to be fake so I’ve just ignored it.

Ever since she wrote the message my mood has been lower than normal I’ve been having nightmares of having a baby one minute and her coming over and it disappears from my arms, she’s made me feel like shit for being in a “small house “ and just made me feel shit like I don’t think I know what I’m doing in life but she does because she got married first and bought a house. I told her not everyone is fortunate to be able to buy a house and renting a bigger place is too expensive.

What should I do ?