Worried I can't have another baby

Shannon • Before you assume-learn. Before you judge-understand . Before you hurt-feel. Before you say-think...💋
Hey girlsss!   Well long story short , I had a little girl when I was 18 , conceived when on the pill, ( wasn't a planned pregnancy ) I was 3 1/2 months gone when I found out, was really poorly through the pregnancy but she came 7 weeks early , (premature baby) she was perfectly healthy, then the doctors told me I had ... polosystic overies 😞 
Anywayyyyy now my daughter is four , and I've come of contriseption a war now so last February, and me and my partner have been having unprotected sex for the past 4 months , I don't seem to be catching , I track my ovulation dates and I try everything I can, but I just don't seem to get pregnant ?? 
Any help? I'm abit worried I can't conceive again!! 😞