This is my second month using the fertility monitor with 33-34 day cycles. Last month it showed peak fertility cd 21 with 6 highs prior. Today I am cd 19 and it's still showing low. Starting at cd 16 I decided to test with the digital advance ones as well in the after noon and got a smiley face cd 18. I thought waking up today and testing with the monitor it would show peak. How can 2 products give me to completely different results? I'm not sure which test to trust. Could my monitor be faulty?