Implantation bleeding or ipill spotting?

Hi My fiance was on her mid-cycle/ovulation and we were going to have sex for the first time. There was some amount of penetration, but as her hymen was thick and it was painful for her with a condom, we tried without a condom just to get through, however even that was painful so we stopped, she didnt bleed and as far as we could tell her hymen is in tact. There was pre-cum but no ejaculation. She took an ipill the next morning, after 7 days she had brownish coloured spotting and abdomen pain. This continued on the 8th day. On the 9th day, today, she has still had some bleeding (little more than spotting but not proper flow like in periods) and the blood is more red now similar to period blood and there were also some clots which she noticed Is this a side effect of the pill? She is worried it might be implantation bleeding. We're not sure exactly what this is, could you help us out? Thanks