My last period was on 12th April 12th May was my expected date But on 12th my I had physical contact unprotected Took unwanted 72 within 4 hours Heavy bleeding with clots on 18th,19th and 20th May 21st heavy bleed without clots 22nd spotting 23rd spotting and stop bleeding 29th urine pregnancy test and it was negative 5th June again urine pregnancy test and it was negative Plz suggest me Is I am safe from pregnancy? And when my next period will come