What Can Cause Pain In The Abdomen Along With Some Blood Spots?

Hi,i am 29 years old and statered sexul life 1year & 6 months ago.I had an ectopic pregnancy on last september and had done a surgery and removed right side pallopian tube.My last period was started on 21st August 2012 but this month's period doesn't happened until nw and my stomach feel bigger,inside burning.paining,sequent urinary pass.I didn't get any check for detect pregnancy.And also on 8th of last month I went to a doctor for get pregnant advice and took Gynozol 400supp. for 3dys,amebazole tab for once,rwabraxin tab for a week.
It saw 21st of this month (after intercose) & today some blood spots and also little pain in lower abdoman .Please advice me what should I do?