Why are they changing??

I had sex two days ago now and my guy sucked on my nipples some, not that much and he fingered me a lot (tmi sorry) but this was new for us, I'm just now realizing that my areoles are getting bigger 😳 does anyone know why? We had sex but with a condom, he did cum once in the condom then took it off and wiped his 🍆 off with a napkin then started rubbing my 🐱 and I'm sure there was no cum on his hands, so I'm pretty sure I can't be pregnant plus I'm on the pill as well.