I dont know if i should go

I'm thinking about going to the hospital but I don't know what to tell them exactly. I am 20 weeks pregnant. I haven't been feeling baby move for the last few days and I was feeling a lot of movement a few weeks ago... Will they see me to let me know my baby is ok? I don't have a doc appointment til Wednesday, so 2 days. I don't know if I can wait. Should I go? What would I say is wrong?