Opinions Needed Please

My boyfriend and I have been trying to conceive for about 3 months now. I'm 5 days post ovulation according to Glow and I'm due for AF in 8 days. Yesterday morning/early afternoon I had a rusty brown discharge with very thick CM. My initial thought was implantation bleeding. Last night/this morning it has been the same color but it hasn't been thick. More liquid like( only way I know how to describe it lol.) Along with this bleeding I've been itchy like a yeast infection along with a lot of pain when I wipe. I've never had a yeast infection hurt only itch though. I'm just a little concerned and highly considering going to the doctor. I was just wondering if anyone had any ideas of what could be going on. Thanks in advance.