12DPO with Pregnancy symptoms,still BFN

I am 12dpo and my AF is due in 2 days, for the past week i have had nausea on and off throughout each day, My DH says im seriously more moody than usual,i have had aches and tingles in my nipples, and DH says he has notice an enlargement of my breasts. 4 days ago I took a HPT, very very faint line in positive box.. An hour or 2 later I went to grab it and show DH and the blue positive line was really dark.. Being that we have been ttc for awhile, i was in disbelief, so i bought a couple more, and they came back neg. So i know how you feel. I have mothered several children in the past, and normally the day my AF was due, HPT's came up positive, Im not going to do anymore tests until AF is 2-3 days late. I know if you want to concieve you can have symptoms and not be,, But i gave up trying the day after i O.We did do the BD the day before and day b4 that.I know you can have sensitive breasts when AF is around the corner, But I have never had that as a sign of impending AF.SO i dont even know anymore. And my cervix is high and firm. Any suggestions or comments? this time im stumped.