What is going on??

Disclaimer: i am sexually active and me and my SO do not use protection. Just pull out method.

I've been having really sore boobs today which is weird bc I am 12 days away from my period. So I know it's not that. Also, I got a random cold sore today. I used to get them every single month on my period or when I'm sick. And I'm not on my period and not sick. I know I didn't get it from my SO. What's going on with my body?? I just got done with ovulation so maybe that??? Idk. What are you guys opinions?