Swollen Breasts

So... I'm not gonna lie. I've had a lot of sex over the past week. And I'm pretty sure that I'm getting a UTI. But something weird I've noticed is my breasts have been swollen after all this sex... even on the days that I havent had sex. I'm not supposed to start my period for another 2 weeks. My breasts dont hurt. They're just swollen and sensitive. What's going on?