Metallic taste and bleeding gums🤢

So on 9dpo my mouth randomly bled like crazy. And was sensitive for a few days.

I am now 12dpo and there has been this nasty metallic taste ever Since.. i cant shake it. Also still a bit sensitive but not as bad.

It feels like somewhere is bleeding in my mouth but its not.

The thing is my tests are still coming up neg even the FRER i did this morning.

AF due the 23rd. Is there still a chance or not so much.. 😩