Worried...

My husband and I started not, not trying to have a baby about three months ago.my periods are very irregular and can’t really be calculated so I’m afraid I won’t be able to conceive. One of my apps say I was in my fertile days last week, but my other one says I’m in my fertile days now. We BD yesterday, but today I started cramping and bleeding. I’m just worried I won’t be able to conceive this month.