Freaked out

Kristle • 24 mother of 3 a son 4 and two daughters 3 and 6 months. Wife to the best man in the world.
I was suppose to start my period Feb 3rd well didn't. So hit the botten for late period then it told me Feb 8th well didn't start then either. So in two days it changed too. I'll be 25on Feb 16th and I have my tubes tide. What should I do or think?