ovulation tests...

Jay🌙✨💜👧🏻👦🏻🤰🏻 • I'm 29, married, and mother of 2. Pregnant with my third which will be me and my husbands first child together. I love to coupon!!! Baby #3 due 2/22/18!!!
I got my period a wk early this month for 3 day last day was spotting so it says I'm ovulating again, I've been testing for 4 days twice a day and keep getting negative opk results... also been checking my CM. this is my second month TTC after my IUD removal in march. I only had 2 period so far. I had one CM watery but the opk was negative... in lost... any advise?!  Thanks!!