So confused 🤷🏻‍♀️

I had a baby in April, I have since had three regular cycles with confirmed ovulation by OPKs and then my period two weeks later. I am taking OPKs this month and my fertile window should've started on the 2nd and I have had negative OPKs ever since. My cervical mucus is still cloudy and abundant...but has not gotten to the egg white consistency yet. I'm so confused why my cycle would be so off this month. I should be starting my period on the 18th but yet, no ovulation. I was sick this cycle, right around my period. Could that throw it off? Any help would be great.