Tips for tracking cycles while exclusively breastfeeding

Morgan
I am 6w3d Postpartum and we know we want to start TTC in September (goal due date no earlier than June due to school) 
However, I'm nervous about not getting my period due to breastfeeding and how to correctly track, I have bought ovulation tests but have never used them, 
Do you have to take them daily or could I do every other day? I read it's important to test in early evening and to try to test around the same time. Any other tips?