7DPO brown tinted discharge?!

My period is due a week from today. I have been TTC but this month my discharge is HEAVY. To the point I thought I had an infection but the doctor said I don't. Even my SO keeps saying "I think you're pregnant" because every time we have sex, he notices I have a crazy amount of discharge! I went pee this morning and when I wiped, I had this brown tinted discharge with absolutely no odor?! Could this be implantation?! Thanks in advance! Xo