12-14 DPO - kinda TMI

Beth
So I think i ovulated on Tuesday 24th  March (that's when I got EWM) but glow said i ovulated Thursday 26th March, therefore I could be anything from 12-14 DPO.. Me and my OH are TTC but I had MC in Feb and don't want to start taking any symptoms the wrong way! I have been feeling a little nauseous for the last week or more, only in the morning and before bed usually. I get tingly nipples every now and then too! Me and my OH had sex last night too, (I sleep naked) and I woke up this morning with browny stained patches on my bed sheets, which looks like blood has been mixed with what I can only assume was his/my semen after we had sex. They were dry so must have happened during the night, but when I went to the toilet this morning there was light brown blood on my tissue when I wipe.. According to glow my AF is not due until Friday and I have NEVER had any spotting before an AF ever!! Has anyone else experienced this or anything similar? I don't want to test until AF is late as I hate BFNs.. Any help would be great!!! Thanks in advance ☺️ x