1st baby

Hi everyone…first timer due July 9th. At my 12 week scan, they found a 3.5cm round fibroid (and a few other smaller ones) on the front of my uterus. They said nothing to worry about now and they will monitor its size and positioning. My question is (and apologies for what might be a silly newbie question), but at 16 weeks pregnant, what is the “normal” lower tummy feeling at this stage? I don’t know if the firmness I’m feeling down there is normal pregnancy feels or the fibroid. It’s not painful in the slightest and it’s not the urge to pee, poo or pass gas, so just curious if anyone can share their experience? Thank you!