Okay so I had my period and shortly after that I had intercourse. Then I took the morning after pill and had another period a week later that only lasted 3 days. That was in December now its February and I still haven't had a period. I have taken 5 pregnancy test and they all come out negative. What's going on?

I would go to the doctor to rule out a pregnancy. Get a blood test, those are more accurate.

If you are very concerned then yes I would go to the doctor just to make sure and put your mind at ease.. but if you took the morning after pill shortly after your original period, and then had another period after taking it I wouldn't be too worried. Your body has had to completely readjust your hormones and it may take a little longer for your body to settle and it can be quite normal to have irregular periods in the following months.. hope this info helps!