to test or wait?

Sarah
This is our third month trying for another baby after September mc. I have 5 days until AF is due. I can't decide whether to wait until after AF is due to test so I have best chance of bfp or whether to test early with first response. Once I buy the tests I find it hard to not keep taking them until the pack is gone...I go a bit nutty haha. No strong symptoms of pregnancy but didn't with last pregnancy anyway. 
UPDATE 
I waited until 3 days before AF was due and got BFP! Fingers crossed this one sticks. I'm so scared and happy at the same time. 
UPDATE#2
Unfortunately I've only had a chemical :( fingers crossed for next month.