hello doctor, i hve a question. so, last period was feb 15-20 had unprotected sex on march 1 and took postinor2 on march 2 in the morning, had bleeding on march 8 for 3 days. and until now april 15 still havent got my period yet. 3 HPT all negative, ultrasound on march 21 negative did HPT again on april 8 still negative. please help me, could i still be pregnant?