Input pls! I’m so confused!

A few years ago my husband and I tried conceiving and had so many problems because I have pcos and wasn’t getting a period which caused me not to get pregnant. We finally did then miscarried... 4 months later I got pregnant again with a healthy baby boy and now he’s a year old. After having him my body regulated itself and I’ve been getting my periods just fine. Got pregnant again and ended in a chemical pregnancy. EVEN with my periods being regular! Now I’m wondering if my issue was ever my period or something else. None of it makes sense. It feels like getting pregnant and carrying full term seems like luck of the draw these days. Anyone else go through unexplained losses??