Feeling pressure every time I pee :/

Recently, I've been feeling pressure down by my cervix every time I pass urine. There is no burning sensation, blood, pain or anything of that nature but it just feels "heavy" down there if that makes any sense. I am 25+4 and sometimes I feel that same pressure when I lay down. My next OB appointment isn't until another 3 weeks, so I'm wondering if this is normal or if I should be concerned?