On march the 13 I had misscarrage after the bleeding was stop me and my husband had unprotected sex know I am 11 days late am getting back pain and cramp I did test 3 days ago it was negative is it possiable that I am pregnant

So sorry to hear of your miscarriage. It is possible that you have become pregnant again straight away, but it may also be your body still adjusting.

Perhaps the cramping is a sign that your period is about to come on. Give it another several days and see what happens. Still no period, try another test. If negative, and you are still experiencing cramping/back pain, check with your doctor.

Doubtful. When I had my miscarriage it took awhile for my period to come back and especially to be regular I don't think I had one for about 8 weeks.