my gues would be it was the morning after pill, because its so full of hormones and its like a bunch of birthcontrol pills, also because you tested and you got negative hpts. i would still contact your doctor and see just incase you do have yeast
I would definitely make an appointment. Things just dont sound right, and you want to make sure everything is ok. Maybe your are pg and tests just cant pick up on it. Get yourself checked. You will feel better. Good luck to you.