Anyone have this issue

I have a irregular period sense losing my baby in October. But I have one every month still just not always the same time so me and my so thought we would try pre seed this month and we have had sex every night or every other night all month we have prolly had sex everyday but maybe 3 days. Because I don't know when I ovulate and I don't want to go buy the strips as they can become expensive after buying them for 6 months. What do you think my chances are if we continue having sex so often and using pre seed every time ?