TTC after breastfeeding

Hi All,

My husband and I have been trying for baby #3. We had a set of twins in Oct 2017 and I breastfed them for a year. I had no period while they were being breastfed and I came back a month after I stopped (Nov 4-9) and was as normal as it was before I got pregnant. We said we would start ovulation tracking when AF came back but she hasn’t. Dec 4- took a test and it was negative. Now I’m anxious...is my body trying to regulate itself or should I test again?