1st date of last period 19th january,my partner and i had unprotected sex on the 22nd, 23rd jan since then no period,i ve a normal 28dy cycle i have been feeling slightly nauseous, sore nipples, cramping on right side lower abdomen like period pains but no period , peeing quiet frequent,tired sleeping alot, went to gp 1/3 tested negative whats happening?just wld like to kn wats wat, going bk to gp 2wks if no period.