Positive ovulation test

I’m in the processing of switching bcs from a combo pill to a mini pill (using to prevent pregnancy we have a 2yr old and don’t want our next one quiet yet) , I had to switch cause I was bleeding 24/7 on the combo pill and had no clue what was a period and what wasn’t.. with that being said I’m currently 4 days into my new bc which is the mini pill, however last night I was really nauseous and felt sick and today had really bad cramps and extra discharge so i took a ovulation test an it popped up positive right away..

Me and my husband haven’t had “ protected sex” with a condom but he pulls out and we still are having it even in the middle of transferring bcs I was just wondering what are the chances of getting pregnant and why I’m still ovulating on birth control

TIA