Hello,
These cramps can be due to premenstrual symptoms. For confirming the status of pregnancy, I would suggest to get your serum HCG levels estimated since this is more specific than urine for pregnancy tests. The HCG (it is a hormone) levels rise only in pregnancy and its presence will confirm the status of your pregnancy.
I hope it helps. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
I had stomach cramps when i was pregnant so yes you could be. Go and have a beta best on the 19th. It would be too early now to test on a cheapie now so it would more than likely still eb negative.