Negative OPK

Emma • Emma.27.UK.Married. Mummy to 2 beautiful boys 💙 Baby #3 due 29.07.19 👶🏽💗

According to Glow, I’m due to ovulate in 2 days time. I’ve taken an OPK this evening & it’s completely negative, no hint of a line which I find odd. I’ve always had faint negatives rather than no line at all. I had a miscarriage mid October (5 weeks) or rather assumed I did because I had a big bleed followed by negative test but I’ve been feeling sick & I’m extremely tired. Would an OPK be negative if I was still pregnant or is my body just readjusting after the miscarriage? So confused :(