Is my sister trying to overshadowed my pregnancy?

So I would really appreciate some other people's opinions because I'm currently torn on the subject.😁🤔 So I have always known my sister to thrive on attention but I don't know or wants to think that's what she's doing now.

So I'm currently pregnant with my first baby who's due in a three weeks and I'm extremely excited.....but I feel like my sister who's only 19 keeps trying to draw the attention away from my pregnancy. So some background on the matter....she just had her baby in December 2019 after she supposedly miscarried August 2018 and didn't find out it until November 2018 when our other sister was having her second baby . I don't know if that's possible after that long but she says it is. 🤷🏻‍♀️ Anyways she ended up getting pregnant a few months after she found out she possible miscarried to have a rainbow baby. So fast forward to when I found out I was having my baby..... in January I was talking to my sister and she asked me when I was due....I'm due July 15. Well after a few days she started to tell everyone that they named the miscarriage and they were having a balloon release June 15 for it. I was surprised but felt like if my sister needed to do that I would support her because she was having major postpartum after the birth. Anyways as months go by she keeps doing things and making it public when I'm around or talking about my pregnancy. Like how she doesn't plan on having another baby but she refuses to take birth control or use condoms because it's bad. It's her choice but it caused major discussion because her and the baby's father broke up but were still sleeping together but also seeing other people. Anyways in April and May I started having complications that are now better but my sister started going around to everyone in telling everyone she took 2 plan B's one in April and May because she wasn't ready for another baby. She then started to tell everyone she miscarried in at the end of May after she took the plan b. I asked her if she took a test and she said no and when I explained to her how the plan b affects periods she told me I was wrong and that she started her bleeding a week earlier so she had to be miscarrying again and that a pregnancy test wouldn't work because she would still have the HCG hormones from December in her body. I just agreed with her even though I know that's not true. Well now that's it's June and I had my first one week check up and called to let everyone know I was 2 cm dilated already. Well my mom told my sister who then called me and was telling me how great that was just before she started to tell me she was going through a hard time right now and having a miscarriage again. When I asked her why she thought that it was because out of 9 test one blue dye had barely a line. She then started saying how she had some clots also and that she was 7 weeks along because her last miscarriage was probably implantation bleeding. She then told me that false negatives happen more than false positive. It just doesn't make sense because she would have had a BFP at 7 weeks and it just sounds like she is having a period but I don't know. She also says her son is probably a miracle baby because she probably can't have kids. My mother says I should just accept it but I literally can't help but look at the facts. My sister now wants another balloon release and I just don't agree with it. I understand every miscarriage is important and awful....but I just feel like it's a cry for wanting attention, especially if she refuses to prevent the chance of pregnancy. Am I wrong? I just feel like my pregnancy is just trying to be overshadowed or if it's just my hormones making me crazy.😟 I just want another opinion. What's your opinion?