Me and my so have been ttc, just started this month. today af was due and i woke up to some blood at 5 am. Put a tampon in and when i woke up around 9 i took it out to only find a little bit of brown blood. And Havent had anything since. Ive had some dull cramps in my left side of my uterus. Judging off the calander id be about 13dpo. Had my last period onthe 4th of july. I took a test mid afternoon, and it said neg. Do you think this is implantation bleeding? If so when should i test again?