I'm not a doctor, but when I was pregnant I went through the same thing right around the same time. Those cramps are actually contractions. That's your bodies way of preparing for the birth.
You can have cramping without pain. That is Braxton-Hixs contraction. But if you are having pain go to your DR. ASAP. You could be having early labor or a miscarriage.
When I was 27 weeks I had period like cramps. I went to the doctor and she told me that I had a bacterial infection that had gotten so bad, it was irritating the uterus and giving me contraction-like...
It is possible. It really would be the questions of whether or not that was your period or if it was implantation bleeding. Implantation bleeding is the result of the fertilized egg(s) implanting...