I’m about to completely loose it

No matter what I do to regulate my period so I can ovulate and get pregnant nothing is working like I liked. Maybe I’m trying to rush it. Idk. But I’m over it and I’m sick of it and it’s making me extreamly depressed and angry. I am still currently trying to get over my brother and his wife just having a baby and being pregnant. I put on a brave face and always put my feelings aside. I tried my hardest to not let it bother me even tho they didn’t even want the baby and tried their hardest not too even took plan B and she still got pregnant. I wake up today (I work midnights) and my dad tells me my sister is pregnant. I knew it. I knew she was. Had a feeling. Didn’t want to believe it tho. And I can barley handle one sibling having a Chile now she’s having her second. And I can’t even get pregnant with 1. But what makes this upsetting is she thinks she is having a miscarriage because they can’t find a heartbeat. I can’t express my feelings anywhere because we’ll they don’t really matter and they cannot relate. I’ve had unprotected sex for 2 years and I have never even had a scare. The scare I’ve had was in my head. I can get myself to be okay with people on Facebook being pregnant but my family I cannot handle. It’s too much to handle.