I had unprotected sex with my gf on 7

Patient: I had unprotected sex with my gf on 7 April during her periods but I gave ipill next day.I also had sex on 17 and 30 April and gave ipill after that. Her periods were to be expected on 30 BT r still nt their. Also she checked for pregnancy on 1 may using teststrip the result were negative .she also took mensovit 6 capsuleson 3 may2015( 3 per day) BT she still didn’t get her periods .plz help

Doctor: