I warmly Welcome you to HCM. Thanks for consulting at my virtual clinic. I have carefully worked through your case , and I can realize your health worries. Reasons for skipped periods may be:- Hormonal imbalance due to the medications interruption (Duphaston). When you are on such hormone influencing medications for long time, it affects your natural production of hormones by body. And if you stop taking medicines, it makes the hormones imbalanced that were being regulated by exogenous sources. Body tries to adjust and create an optimal balanced state of female sexual hormones favorable for ovulation. It causes a delay for the system to kick in. Wait for a month to see what happens. If not normalized you should get yourself physically checked by the Gynecologist. No there is no chance of conception/pregnancy if he didn t ejaculated inside. For complete satisfaction you may test tourself for beta-hCG levels in urine in the laboratory available nearby. Hope it helps. If you need further assistance, contact me anytime. Regards! DR.HANIF USA