Implantation bleeding?!😱 Lost last baby to Trisomy 18. I hope this is IT.

Brittany
Me and my partner have been trying for only 2 months, so I'm a bit skeptical. I got my period May 1st-5th, haven't been on birth control, and have been having unprotected sex everyday for the past 60 days ( I know, I know.) After Feb.18 we had sex more than once a day or at least once. So, now I've taken pregnancy tests and they are all negative. I'm getting, tender nipples, a perky feeling chest, backaches, I'm not acting myself, headaches, I threw up, I'm tired ALL of the time. The brown discharge does not have an odor by the way. Any information will be greatly appreciated. Help me ladies PLEASE!
Update today, brown discharge stopped but no period. What do you guys think? :/