Okay so I had sex last Saturday & my boyfriend said he came in me. So all this week I've been thinking I'm pregnant, I've had some early pregnancy symptoms, such as headaches, cramping, a little constipation, & mood swings. But today my period is supposed too start, and it did. But I still think I'm pregnant. Maybe it's implantation bleeding. I don't know, I need help.

You would not be having pregnancy symptoms that early, a week! You got your period BUT in three more weeks you had better take home pregnancy test.

A week after sex would be way too early for pregnancy symptoms. You got your period as expected, so it's very doubtful that it's implantation bleeding. Having said that, we can't tell you for sure if it is or isn't, not even if you sent us a sample to test.

I'd bet that you're not pregnant this time, but don't get discouraged. If you keep having unprotected sex, it will happen soon. Obviously you're trying to conceive. So baby dust to you and your boyfriend.

Good luck.