What Causes White Vaginal Discharge Upon Using Mifegest Kit?

What Dr. We hv a son aged 1 yr . And so we r using femilon as a contriceptive pill for last three months without any problem. In last month my wife missed the pills for first four days of her menstural cycle and after that she taken it regularly our doc. Said we can overrid any problem.. But now in this month it has more than a week she passed hi mensturation fate without any bleedin we seek our doctor n he comfirmed a pregnency by pregnensy test kit. As we didnt prepare for it n hv some family problem he advised to take mifegest kit on 9 th day passed after my wife s mens date. She taken first pill at 15/5/17 at 12 00 am .first cytotek at 7:00 pm 17/7 and then at 11 pm of 17/7 the second one taken orally . Today on 18/7 she found some cramping but there is some white discharge like mucus contain for 5 times.. Bt there is no bleeding or further cramp.wht its ? Should we consult our doctor again now or can we wait to take the full course. Why is this happening?? When we can see that its bleeding normally or wht we hv to do?? Pls ans me as soon as u can.. Thank u..