Pregnancy testing?

Mags
FTM here. So I am currently 13 weeks postpartum. I'm been breastfeeding and pumping at work (before and once during a nine hour shift then I feed her when I get off). Little one has been sleeping through the night consistently for the past month (anywhere from 8-12 hours). I have yet to get a postpartum period. I have read that some women don't have a period the entire time they are breastfeeding, even when the baby is sleeping through the night. 
So I was wondering, should I periodically take a pregnancy test until I do get my period back? Has anyone else done this? And if so, how often did you test? 
(I'm a little paranoid about getting pregnant again since I had an emergency c section and am worried about the complications that could occur due to still healing up.)