TTC with “bad” sleep patterns

We have sex At least every other day from end of my period until the start of the next and we aren’t pregnant after a year and a half. We haven’t gone 3 days without BD unless I’m on my period. Starting to think we should see a specialist maybe. My cycles are around 35 days so that’s annoying also. So I work night shifts and occasionally get called into work in the middle of the night, unexpectedly. We are on 1 year and 6 months TTC. I can’t get accurate bbt consistently. My LH tests aren’t reliable because I’m sure I’m testing at the wrong times when I have a night shift. If I even remember to take one at work. What else could I be doing or try? We suffered a loss in January so I know I can get pregnant.