Basically my last period was on the 17th may and my cycle is 31 days. I had unprotected sex with other half and about a week before my period was due ( which i still hvnt had yet) i had brown discharge for atleast 2 days! it had streaks of blood in it! was that implantation bleeding of was it something else? im now 1 and a half weeks late should i take a test or should i wait a bit longer?