I had unprotected sex 4 months back and took an i pill within 48 hours. I have a regular cycle of 29 days. My period flow was heavy for 2 days, medium for 2 and low for a day earlier but since i have taken i pill, my flow have decreased to 3 days medium and 1 day low. Can it be a side effect of the pill. My cycle is still regular but i had cramps in last 2 periods which rarely occured before. Is there a chance of pregnancy or is it just side effects of the i pill? Also i did 3 home pregnancy tests at different time and all 3 were negative.