We Have Kids, a site created by moms, dads, educators, and family experts, interviews Mark P. Trolice, M.D., for his insights on how a woman can determine if she is pregnant or if her period is just late.

So, when do pregnancy symptoms typically start? “Usually 1-2 weeks following the missed period,” says Dr. Trolice. “This is 5-6 weeks estimated gestational age.”