I can understand you wanting to test each month under your circumstances. I'm on a 28 day active tablet minipill which may stop me from getting AF so I've started temping as I'm paranoid I'll be pregnant and not know that I am as my pregnancy symptoms were mild. If it's working for you keep doing it.

My fave HPT's are the lullaby conception ones that you buy online. I got the ones that you can use early and you wee on them (not the cup type ones). They are very cheap so are great for anyone who could be testing a lot. I never got a false positive on them - they were positive for the two pregnancies I had while using them and negative on the non pregnant cycles. I believe they are very reliable and can highly recommend them. They only take a few days to get them to you.