I am 21 years old and married. I had about a month ago, unprotection sex.

I used to be on the pill, but stopped it like 2 or 3 months ago.  I always get my period the first week in the month and I had it last in July (first week in July). It is now almost September and I still have not got it.  My stomach is swollen and I am constipated. I feel tired. I also get headaches now and then. I did a test about two weeks ago and it was neg. I saw a doctor and the doctor was not very worried, but I am very. Could I be or not?

Can someone help me!