Should I be concerned if my period is 8 days late?

Kelly
Before, my period was very irregular. As it is in my family. It took my mother 6 years of trying to conceived her first child. It took my sister 3 years. And now me. I have not been trying for as long as they have. Only for about 7 months. Before all this. I could never determine my cycles. The my OB put me on Clomiphene, that somehow regulated my cycle to 44 days exactly. I finally could determine my ovulation. I have been counting now 8 day past and still no period, but every test shows negative. Should I be concerned? Is it still too early to tell? I'm TTC my first child so am very inexperienced. Any tips or advise will help. Thank you.