I saw my last period on d 31st of march and My boyfriend nd I had sex on monday i.e 1st of april and I took postinor 2 after we finished everything, i had vaginal bleeding 7th april for 3 to 4 days...today is 29th of april nd I avnt seen my period I'm feeling cramps in my vagina and waist lyk I'm about 2b on but I avnt seen a drop. what should i do?