Is dabbing healthy?

Me and my boyfriend have been together for a few years already and getting pregnant just hasn't happened for us. To my fellow smokers, he is an everyday dabber (smoking a high concentrated form  of THC in the form of wax), I don't dab I just smoke weed maybe 2x a month, if I'm lucky.  My question is could his smoking habit be the reason why we haven't came out pregnant? We have friends that are everyday smokers, not dabbers, and have managed to have kids but we have no luck. Please any and every insight is appreciated! 🙂