Withdrawal bleeding after I pill. What?

I got my last period on 7th June and I took i pill on 17 June within 4 hrs also we didn't have proper intercourse it was just once he went inside but before 2nd try the man came and condom break and there was something wet near my vulva hence for precautions I took I pill and i have 32 days period cycle i have got bleeding on 11th day that is on 28th June after taking i pill. there are some clots and blood dark red also lil bit of dark brown discharge. I have symptoms like back pain , cramps and vomiting like feeling. I'm worried if this is implantation bleeding or what ? Also I have PCOS but my menustral cycle is regular since 4 months without any medication and my weight is 70. Can DR please suggest what to do in said case