Hi, I Am Experiencing Some Tender Breasts Since Right After

hi, I am experiencing some tender breasts since right after I finished my last period. now my period is due in a bout a week and my breasts are still sore, my nipples sometimes erect and my aerolas puffes up. I do not have any other symptoms than that. I am really worried that I am pregnant. before I had my last period me and my boyfriend had sexual contact but we did not have sex. he had only touch my vagina with his tip and that's it. and i was late for my period but I got it anyway. ive been doing a lot of pregnancy tests and they all came out negative but right now i am worried that I am pregnant? is there a chance of getting pregnant even after getting your period. if not, why am I getting these symptoms even after ive already had my period.