Complicated situation, I need thoughts.
So we both are teenagers who popped eachothers cherry. The intercourse happened at 15th of April last month and it went like this. It all happened completely unexpected and really sudden, at first I just inserted the tip and went pretty little deep since she was hurting a lot. But we stopped before I even came close to ejaculating. Then I masturbated and came in the bathroom, we took a shower, waited like 30 minutes (I can't remember if I pissed or not) then had a second round which I went deep inside this time but then she started bleeding from probably her hymen tearing and we stopped immediately after that, I didn't even come close to ejaculating this time either. Then we started worrying about pregnancy and immediately went and took a Plan B like 1-2 hours after the intercourse.
Her last period before this started at March 26th and she has a little unstable 28 days cycle. We were scared since 15th of April kinda falls in the line of her ovulation and if so the Plan B wouldn't do shit. But after she took the pill there was no visible side effects nor any unusual symptom or feeling on her. I checked up each day.
After a week after the intercourse, on 22th of April, she started having cramps and bleeding lightly at midday, one day earlier than her cycle would be and the flow increased as it went on to midnight that day and she had a normal, red colored flow and heavy cramps for the next 2 days aswell. But it slowed down at days 4 and 5 as it was just little brown blood in the mornings. So in total it took like 4-5 days and she says she filled up 3 pads in total. It is 9th of May today and I'm still worried but she isn't cause she says that it surely was a period and that I should stop bringing this up and stop making both of us stressed. She is surely right but it just that I can't let go of this scare. I told her about taking a test this week and we both agreed but before that, I just want y'alls thoughts on this. Some say that heavy implantation bleeding can be like that or you know it could be a Plan B withdrawal bleeding etc. and those just nibble on my brain.
Thank you for reading.