Birth control patch.

I used this method after we had our son and stopped when we decided we wanted to try for our 2nd. After i had my daughter I got back on it. I was on it for a few months before my insurance got cut off and I wasn't able to afford it so I got my insurance back on and have been taking it now for a month and a half and I would swear if I wasn't on it that I am pregnant. But I'm wondering if I'm just having ovulation symptoms? My breasts hurt, I'm super emotional, having cravings, nauseous. I looked it up on google though and it says the patch prevents ovulation so that can't be possible right? I'm so confused this is the only time that this has happened out of all the times I've worn the patch. Any input ladies?