3days late on my pd

I was supposed to start my pd 3 days ago I had my last pd on Jan 2 and my calendar shows I was supposed to start the 31st it usually is on time but it's not this time so I'm freaking out if I should take a test or wait til after tomorrow I have been cramping but that's it I keep going to restroom nothing with my other 2 kids I tested as soon as missed a few days Nd it came out positive but I don't want to get my hopes up either... Idk