Sore Lumpy Boobs

Von
Hi All....just wanted some advise really!?
According to my Glow Record in Fertile but my boobs are killing me. The feel like lumpy rocks and nipples are sore I've had to take my nipple bar out!!
I'm worried that it might be something serious but just wanted to check with everyone before I go stressing
Can it be because I'm fertile?
Thank You All xxx