last month on June my period came three time at first it came like the 3 of June but it was really light and it went away like in three days then on June 8 it came again and it was a very little amount of blood it went away like in two days on June 12 I had sex then like on June 17 my period came again then on July 8 I had sex with another guy and my period hasn't come ever since the last time it came . Could I be pregnant ?