Keep leaking urine

So for the past week, my bladder is acting weird it doesn’t matter how many times i go to the bathroom I keep leaking urine when I don’t need to go. Yesterday I was at my grandmas and I didn’t need to go at all then suddenly my underwear felt wet and later on maybe an hour I went to the bathroom and my underwear smelled like urine and then I was just at the store and I literally had to pee and couldn’t stop it. I was so embarrassed I left. No one was around me but still.. I have two kids so I don’t know if that’s related but this has never happened to me before. I’m also not pregnant either I’m also only 21