Hard time conceiving

My boyfriend and I have been TTC for about 7 months and we haven’t had any luck. We have tried lots of things and this past cycle I went 41 days without a period, I’m not sure if I’m ovulating but I’m getting worried because I’m not sure if this is a sign that I’m infertile. My boyfriend and I are pretty healthy so I’m not sure why it’s so hard for us to conceive?