Could this mean infertility?

My fiance and I are going to start trying to get pregnant soon but I'm a little worried. My current cycle is between 5 and 7 weeks. I am currently on 8 weeks without any signs of it happening soon. I am a healthy 24 year old. I'm pretty sure I'm not pregnant seeing that my fiance has only been in the country once since February. It is now 3 months since he was home and I only got my period once in those 3 months. I have taken a pregnancy test every day for about 6 weeks after he left seeing that we are trying.

Rant over, I just want to know if a 5 to 7 week cycle is semi normal or should I get help.