After two years I would go see a fertility specialist. Secondary infertility is a fairly common issue.
I had the same problem went to specialist nothing wrong with both of us I think my problem was that was not ovulating when I think I was.. I used the app FLO and track my period and had sex before, during and after ovulation and I got pregnant naturally my boy is 2 1/2 now
No it’s not normal. Have you been tracking ovulation? I would do that first and also evaluate both your diets.