AF due 3/26 but got a positive OPK instead.

Mackenzie
I have taken multiple FRER tests and all have been negative. AF was due on 6/26. I have been really really tired, cramps, mild backaches and really sensitive and achie boobs. But The day before my period was suppose to be due I had mild cramps (like ovulation cramps) on just my right side. So when I peed in a cup for a pregnancy test I also did a OPK I have left over. So I had have a positive OPK on 3/12 and 3/27. My periods are irregular. Is it possible to ovulate more then once weeks, apart in one cycle? My period is now 4 days late. I am so confused now.