Any input .. Not sure what to think

Kelsey • I have been trying to conceive my second child for two years... I am so happy that it has finally happend!
So got positive OPK on dec10 dec11 dec12 and dec13 all were very dark positives. 
For me I would count DPO from last positive OPK so I am not 18 days past ovulation. 
*we had sex every positive ovulation day with preseed and every other day after that
My boobs have been sore and tender for about a week. I had really heavy Whitish CM for a few days then it went to clean and today I had more whitish CM. 
Yesterday I got sick for no reason, today I kept getting dizzy, I've been kinda moody and tonight while taking a bath I felt like something was kind of tightening then relaxing in my low abdomen. The left side is soft but my right side is hard . 
I took a pregnancy test on the 29 the and it was negative... 
I've been pregnant before but when I found out I was already 8 weeks so I didn't pay attention or notice any of the really early stuff.