I've been having unprotecte sex i just got off my periode a week ago & now i'm back on it but my period is coming out watery and i'm spotting a little?

Unprotected sex: It sounds like you are having mid-cycle bleeding, which is pretty common, especially for women taking birth control pills or shots. The other very common cause is just stress which produces irregular cycling of the hormones and intermittent bleeding. My advice to you in your situation would be to get a pregnancy test. Any time you have an abnormal period after unprotected intercourse, get a test.