Sore breast!

My boobs are extremely enlarged sore and tender and alittle hard. Period is a couple days late according to glow but my last cycle was a week late so I honestly have no idea. Took a prgnancy test and got an invalid result, like literally there we no lines at all. Not even the negitive one. Had sex on my most fertile day with female orgasim and I was on the bottom during ejaculation! What should I think? And any tips to give my boobs relief, I am having intense pain.