Hello We had unprotected sex for several times after my last period was over (last period on 31 th December. And expecting the next period on 29 th January but it occurred on 26 th January with pink spotting and on the next day some deep spotting, on the third day it became heavier (have to use 2 pads) but not as my regular period. Before spotting I had no any symptoms but the lower back pain on and off. I had cramps and pains all over my lower parts when I get my regular periods but this time I am feeling something different, that only my lower back and lower abdomen is paining very badly. So I am confused, is it my regular period or implantation bleeding or anything else? Please help me out.