Girls, hello ? I'm at week 35 now, my belly has been pulling hard sinc…

Girls, hello ? I'm at week 35 now, my belly has been pulling hard since yesterday, I stood under a hot shower last night, it didn't really help. I thought it would pass today, but it still does, though not as much as yesterday. I don't want to call the doctor yet, I usually avoid panicking too early, I want to observe how things are going. Has anyone else experienced this at such a stage?