One month passed since I had unprotected intercourse.. took an ecp even though he did not ejaculate inside me. Got an ultrasound today and took a hpt. Its negative and the ultrasound report is normal. Could I still be pregnant. I had bleeding for 3 days which was lighter than my normal menses around the date my period was due. About 5 days early. Maybe its cause of the pill?

Yes the pill will alter and effect your period, even cause it to to be missed.

But what type of pregnancy test did you take, a urine test would not normally show up till about 2 weeks after you miss last period

I took a urine test only. Thrice.. and all came negative. No other symptoms as such