So confused

Gigi • Mommy of 1, foodie, fashion and makeup addict!
So today is May 1 still no AF. Took a HPT and got a BFN. Then I think of my sister who went through the same thing. Well my niece is 3 months old now. Guess I'll give it some more time and if still no AF I'll make an appointment with my OBGYN. Any advice?