21 weeks cramping and pressure?

Just looking for some reassurance here. I’m 21 weeks today and starting yesterday morning as soon as I got out of bed I noticed all of a sudden I feel like a mild but very persistent heavy feeling low in my pelvis. It’s not painful at all, just feels like pressure if that makes sense? I’ve also had some mild but very annoying cramping sensations very low down, like down where my pubic bone would be and I’m just wondering if anyone else has experienced this or if it’s considered normal? I feel baby moving around periodically throughout the day so he seems to be fine but I’m a FTM so just a worrier! I tried to ask my doctor about it yesterday but she kind of dismissed it and said if I was worried I can just go get checked out in L&D. Would like to avoid an unnecessary hospital visit!! Thoughts?