Concerned now with emergency pill

Ok so this is everything that has happened:

I had unprotected sex on june 11th, i took the emergency pill on june 12th, the day my fertile window began but it was still within 24hrs of unprotected sex. 5 days after taking this pill i bled heavily with clots for a couple days.

I’ve been feeling not the same since I’ve taken this pill 4 weeks ago. My boobs get random pains but its not severe pain its just random twinges. I get mild cramps / twinges. I’ve been losing alot of weight and I’ve been feeling bloated and sometimes in school i get a little bit dizzy then it goes and also tummy pains and very watery diarrhoea which started on Saturday 😪🤕 my period was meant to start on 1st july but its 8 days late. I took a pregnancy test when my period was 2 days late (last Wednesday) it was negative. And then i went back to the clinic and took another one today (8 days late) and it was negative again.

The nurse told me the pill effects would’ve worn off by now because its been almost 4 weeks.. then if its not the pill then what could it be? Whys my period so late and why do i feel weird