Pregnancy came to a pause..

Samantha
I'm 17 weeks and 2 days and up until this point I have felt pregnant. I don't really have a bump yet, definitely carrying some extra belly girth but not a solid bump. But my belly would get so hard and round in the mornings and I was experiencing round ligament pain..I just all around felt pregnant. Well, over the past few days since I hit 17 weeks I feel like all that went away. My belly isn't even really noticeable anymore. Should I be concerned? I go tomorrow to hear the baby's heartbeat and I'm sure everything is fine but I'm nervous.