I had my baby boy almost 5 months ago and finally had my first period about 3 weeks ago! I am now trying for baby #2…

I had my baby boy almost 5 months ago and finally had my first period about 3 weeks ago! I am now trying for baby #2 (yes it's fast, please don't judge). I have been tracking my ovulation twice a day using opks literally since my period stopped and NOTHING. I'm on cd20 right now and it's not even trying to darken lol. My question is: did anyone else maybe take a few months to ovulate again?