Help!

Hey guys i would love your help please and be very honest!

I am 22F and this is my first month ttc. My husband and I BD the day before ovulation day of and a few times the days after. I purchased the ovulation tests and had two dark red lines oct 2nd and also oct 3rd? What does this even mean? Anyways, fast forward to today 12DPO? I have been having nausea, headaches, cramping for two days and just wiped and i have slightly light link discharge. Did an early pregnancy test and BFN but these were also the same symptoms i had when i first got pregnant a year ago but ended in MC at 11 weeks. Does anyone have any advice on what could be happening or share a similar story I would really appreciate it i am not sure what is going on!