I dint understand ur concern, and what exactly you wanted to know..
Do u have Regular Menses and are you concerned whether ur
pregnant?
Neways less likely you wud be pregnant if taken an I pill within 72hrs.
For the intermentrual bleed it could be due to lot of reasons, u need evaluation for the same..
Health Tips
I would suggest wait for ur periods, if missed get home test again and than seek advice.
its quite possible ur dates would postpone with I pill