Cramps in early pregnancy

Hello! I just found out on Friday that I am pregnant (yay!). I was supposed to start my period on Thursday and my best guess is that baby is 3, 3 1/2 weeks along. I've been feeling cramps the past couple of days, similar to menstrual cramps but lower in the abdomen. I'm a little scared because my mom said cramps during pregnancy aren't normal :-( any moms out there have similar experiences?