I need help and thoughts please

My husband and I have been trying to have a baby since April 2017. My period is very irregular and I can’t find out when my ovulation day is. I’m on the verge of getting enough tests for a whole month and hoping I can pin point a day. What’s my best option? I’ve taken prenatal pills because I heard it helps. I was diagnosed with cancer when I was 17, I’m 23 now. The type of cancer I had shows that almost everyone is still able to have kids so I think it’s my period that is messing things up. What do I do? Home remedies to help us? I don’t want to go to the doctor just yet, and we both are so ready to have a baby and every time I get my period it’s just heartbreaking for us both. My period ranges from 2 weeks, to a month, to a little over a month. The ones that are a little over a month are the most heart breaking. He has a kid, so we know he works so it’s me that’s the problem. We both want to try to work it out at home before the doctor comes along. Any advice on how to get pregnant faster? How to regulate my period at home? Ovulation date checking with irregular periods? Anything helps please and thank you.