Is concieving easily hereditary?

I think yes its hereditary, my mom though having 6 kids found it very difficult to fall pregnant, tried for over 3years before having my sis. of the four of us, only one of my sisters have found it easy it to fall pregnant, I'm still trying after ova 2 years, one of my sisters just fell pregnant after trying for 2 years and my eldest sister had to go through ivf, which is the route I'm taking now. so if I'm following in my mums footsteps and struggling to get pregnant, its possible you could have it easy like your mom, hopefully u're not lyk my other sister who's different from the family.