help!

Rachele

my last period was December 20th my cycles are 30-31 days. according to glow my period should be here today. No sign of her. No spotting like usual. We only BD once right before my O. Haven't tested yet. Sooo expensive to keep testing. Anyways think I should test tomorrow if no AF? Or wait til Monday? Btw: my son was conceived on New Years in 2013...might just be our month to make babies! 😉