Need some encouragement...

Hello everyone! I'm 25 years old and have been TTC #1 since September of 2013 (and I know that's not very long but I'm worried I'm having some issues!). I was on ortho tri cyclen lo for 10 years and since stopping, my periods have actually been lighter and shorter (3-4 days instead of 5-7 days when I was on bc). The first month off of bc I got positive OPKs and even felt ovulation symptoms... but haven't had any positive OPKs since then - I test 2-3 times a day! but my cycles have been spot on - 28 days every time. I just started bbt charting but my temp this morning was 96.6, which seems really low. I had my thyroid levels checked a few years ago and everything was normal. Starting to feel hopeless... :(