Spotting hasn't stopped even after 9days

Spotting has not stopped for my girlfriend from last 9 days. We got a bit careless this month. Is this normal withdrawal spotting because of Ipill? I have mentioned relavant dates below. 20th March : had unprotected sex, did not ejaculate inside 21st March : took Ipill after 30 hours 29th March - 31st March : periods 3rd April : had unprotected sex, ejaculated inside 4rd April : took Ipill within 24 hours 7th April : had unprotected sex, ejaculated inside 8th April : took Ipill within 24 hours 14th April : had unprotected sex, ejaculated inside 15th April : spotting/bleeding started, normal bleeding, took pregnency test in the morning - negative, took ipill within 30 hours, 16th April : light to no spotting 17th April : normal bleeding 18th April : normal bleeding 19th April : light spotting 20th April : light spotting 21st April : light spotting 22nd April : light spotting 23rd April : heavier spotting