I had unprotected sex on may 4th my period is somewhat un-regular so im not positive on when its supposed to start. On Saturday, may 11th i had unprotected sex again, when i went to the restroom, i noticed I had a light pink discharge. I was told it could of been implantation bleeding. Since then, ive noticed white bumps appear around my nipples, my breasts are very sore. I have been experiencing a lot of nausea, and head aches. could I be pregnant? If so when should I test?