Hi I Had Unprotected Sex With My Boyfriend Two Weeks

Hi I had unprotected sex with my boyfriend two weeks ago & I started bleeding not this Saturday that just passed but the one before that & its hasn't stopped yet but I been on bc depo for 3+ yrs & never had a period it would be just little spotting here & there but that would only happen when it's close to getting my next shot,I'm also due for my shot which is tomorrow btw could I be pregnant a little worried here?