1 day period?

I've been TTC for a year this month and I'm still not pregnant. This cycle I didn't track anything but I know we had sex around the time of ovulation. Shortly after ovulation and still going, I've been crying over just really stupid things. 7 dpo I got cramps which isn't normal for me. I'll get them like the day my period is going to start. I had cramps 8 dpo as well. 10 dpo I had light brown spotting. I woke up in the middle of the night (going into 11 dpo) bc of a HUGE gush of blood and it had clots in it so I assumed it was my period even though it was 3 days early. The next day I used a tampon and when I removed it there was NOTHING on it. I wore a pad for the rest of the day and still nothing. Nothing the next day either. But the day after that and yesterday I had brown spitting but only when wiping. I took a pregnancy test yesterday and the day before and they were both negative. Any thoughts?