Sensitive nipples

I'm on BC, the patch. Haven't messed it up in the 3 months I've been on it. I'm going to the IUD after this pack just because I hate having this feeling of anxiety every time my body does something weird. (Like I forget what's normal as soon as I think something is off.) My nipples are tender but not like a sore tender, they feel as if they are a "stimulated" sensitive. Could I be ovulating on my patch or is it just my bra? I had a period last month so I don't think I could be pregnant but I was sexually active during my forecasted fertile time. No condom, he pulls out, no poor timing incidents (other than when it almost got in my eye). So what's up?