hi, i started using petogen in december 2016, and was due for another one on the 27th of feb this year, then i went on for my periods for almost over 3 weeks. then i had my next shot on the 24th of march instead of 27th of feb . so after my last shot, after 2 weeks, my periods started agin. i am now on the third week of my periods. please help. is this normal ?