What Are The Side Effects Of Using Emergency Contraceptive Pills?

Hi, It was our 1 time and I used condom and for more security, she also took ipill. her period comes on same date but only for 2 days (normal 5 day) & then stop, but again after 2-3 days it started and continue till5th day. please suggest. we can t visit any local doctors. Will it becomes normal after some times? SHe is 23 year old and have normal weight. No other problem. Earlier feel lots of pain during period & checkup-ed many times to doctors, but this time pain was not there so we were happy too.