So confused!!😞

Okay so I ovulated 11/21-11/27 and bd everyday. Been ttc for 10 months. AF isn't due until the 10th but thursday I started to noticed light brown spotting when I would wipe and everyday it has picked up a little. Today I have a light tampon in and has verryyyyy mild cramps yesterday. And extremely fatigued. My period is never a week early and I NEVER in my life had a ligh period. Day one I'm doubled up in pain and bleed through supers in 20mins to an hour. Sorry tmi!! I just don't get it. I thought it was implantation bleeding but it's gotten a bit heavier it's like a reverse period that doesn't get heavy like a full flow. I'm at a total  loss. I tested everyday since Thursday and get bfn. This was my our last time trying because my husband is in the military and won't be back home until late next year. Please if anyone may have an idea it would be greatly appreciated! 😪😪