Pelvic pain after sitting too long and after waking up

Hi mommies, I’m suffering from pelvic pain especially when waking up and from sitting too long. As if I need to hold it/ press it when walking for the first few minutes. I walk in pain but after few minutes of movement is not so pain. I’m 31 weeks now but started this pain since 28 weeks. Is this normal. Now is getting worst the pain.