Positive opks

Last cycle was 57 days of something crazy like that. I got tons of positive OPKs. I also had several negative OPKs. Now, this cycle it looks like I Od cd 15, based on temps and symptoms and positive OPks. But... I had positive opk CD 10 then it was negative for a couple days. Then positive again on CD 13 and CD14. I took one yesterday, negative. I took one today positive. So... is it normal to be having multiple LH surges?

I'm 38, have 4 kids. I didn't need help to get pregnant. I had mirena before number 4. Got pregnant within 3 months of having it removed. That ended in MC. Got pregnant again had baby number 4. Baby is 11 months old. This is Ava and probably doesnt help much.