How many weeks do you start to feel the baby move everyday?

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I'm 18 weeks and I don't feel her everyday. Some days I do and some days I don't. It's more of a rolling sensation that I get and only 1 or two times a day when I do feel her. So far its been 3 days since I've felt her. And is this normal? It's all so scary I can't wait until I actually feel her every day and her movements are stronger