Iam so confused. I got my period on the fifteenth of september. It lasted until about the 20th...Rite when my period was done I had sexual intercourse without protection..Following that day I had it about 5 times without protection. On the 30 of september ( a saturday) in the afternoon I had one spot of very light blood on my underwear wen I went pee...I wiped and there was no blood on the tissue or nething. Following that day I began to have tender breasts, only when I hav my bra or clothes on...Could I be pregnant? Was it implantation bleeding? Im soo confused.