Ipill effect. If i don't get my periods.

Timeline: ( kindly provide a detailed answer ,I am really worried ) 1. Last normal period: 6th August. 2. iPill taken: 18th August.( I didn't have sex but while being fingered some semen or precum on fingers might have entered my vagina so I took ipill as a precaution within 24 hours) 3. bleeding: 1st September (14 days after the iPill, lasted 2-3 days, mild brown with clots), i assume it was withdrawal bleeding 4. Expected period: 6th September, but no period since then. 5. Home pregnancy tests: Multiple negative results, including the most recent one on 1 st October I am worried since i haven't got my periods yet and it's been almost a month after i last got some mild bleeding mostly withdrawal bleeding Kindly tell me by what time i should still wait for my periods to come since it's too late Also when to see a gynec in person if I don't get my periods.