Weird burning/cool sensation in nipples

Hi there, my husband and I had sex multiple times within the past four days. My periods are irregular, so I’m not sure if I actually ovulated a few days ago when I was supposed to or not.

Anyway, today I had a weird sensation in my nipples like someone had put icy hot on them. It was really uncomfortable. I’ve never experienced it before.

I’m due for my period in 9 days and I’m certain it’s too early for any “symptoms.” Id just love to know what that weird sensation in my nipples was! Anyone else experience that?