I had my periods around 10-13 May, 2016 and had protected sex on the 29th May, 2016. I took a pregnancy test on 14th June which was a negative and then had my periods the next day, on the 15th and it lasted for around 3 days. Is there any chances of it being implantation bleeding? I had cramps and bloating around the 23rd - 30th of June, and took a pregnancy test on 28th of june which was negative. I took another pregnancy test on the 1st of July, 2016 which was again negative. It is 15th today and I still have not got my periods and I have very scanty white discharge and slight cramps. Is there a possibility of me being pregnant? Also I took an ultrasound on the 4th of July. The doctor said my uterus was normal. I am getting so paranoid. Please help.