I had my periods on 19th july for 3 days during this I had a sex with my partner for safety I have taken I pill and I found slightly spotting form 3rd august to 5th august it was not heavy as periods flow I have tested my pregnancy through pregnancy test kit and it gave me a negative result but it's now more than 29 days of spotting but till now I didn't get my periods what is the reason behind it please tell me is there any chances of pregnancy?