There can be no doubt that you conceived as blood test
is reliable; you had sonographic evidence also. There might have been a complete abortion
when you had those cramps and spotting. The pain you have at present could relate to some urinary infection and you should get yourself evaluated for that. If in still a doubt about your status of pregnancy, you can have a serum beta-hCG
test coupled with a trans-vaginal sonogram. Wish you good health.