I am 21 years old. I have cycle of usually 32 days which varies after 2 months and sometimes it becomes 28 days and sometimes 30 but it is within 32 days always. I had my period on 24th June. I had unprotected sex with my husband on 3rd July. After that I had bleeding on 21st June. Usually I have heavy bleeding always which lasts for at least 5 to 6 days (probably 5).but this time it was not so heavy but not so light also (lighter than my heavy periods. It lasted for 4 days. On 6th day I was having brown mucus. please tell me is it periods or implantation bleeding. I don't want to get pregnant now as I am also studying. please reply soon.