when do you take a test?

So I'm in my first cycle of ttc.

Since in breastfeeding my cycle isn't always on the dot regular. I was supposed to get my period yesterday but it didn't come. So I'm 15 days past ovulation I think. Should I test, or wait longer?

Edit: now 7 days later i got my period.

I feel a bit silly, cause I had so many pregnancy symptoms including morning sickness, which suddenly disappeared, half an hour after I got my period. A woman's body is just amazing. How it can trick you into believing your pregnant lol.