hello, i had unprotected sex on september 17th but the next day i came on my cycle for about 5 days....i've always had a regular period but no symptoms such as breast tenderness or throwing up but i am currently on my cycle and i have been throwing up and have had tingling/ sensitivity of the breasts als dry flaky skin around my breasts but not the nipple. i took a home pregnancy test about a week ago and it came out invalid...im concerned and dont know what to do.