I'm freaked out!

Elizabeth • Married for 2 wonderful years and have a beautiful baby girl!
So all day today I've had this stomach ache, it has came and went throughout the day until the last hour or longer. It goes from being a dull ache to a wave of pain every now and again. I have a friend that works in labor and delivery and she said to rest my hand in my belly button area to feel for my stomach to tighten but I can't tell if it is when I have the pain because of where the baby is laying. The pain/ache is right above my belly button and it hasn't gotten any better. It hurts more when I stand up and move around. I'm trying not to get my hopes up and I've not even said anything to my husband because I don't want him to worry. Should I just stay to myself and wait it out to see if it gets worse?