How long does implatation bleeding last. I do believe that's what I am having because I thought I was starting my period but my period has never been this lite . I had sex about 15 days before my expected period and 2 days after my date of my period I began to bleed but not very much at all. About 2 1/2 days the bleeding lasted

If it is going to happen, which it doesn't for everyone, it often will be for just 1-3 days. Might have been due to implantation, may have been an off cycle, but I hope it turns out how you would like it to!

How long should I wait to take a pregnancy test?

If it has been a couple of weeks since you had sex, you can try a test. If it is negative, see what happens when your next period is due.