Baby movement? When did you KNOW you were feeling baby?

Today I am 15 weeks and 3 days 🙂

At random times I feel muscle twitches in my lower abdomen. I can't set this feeling aside from gas. I talked to my doctor over the phone today and she said that I should be feeling movement by now and as time goes by it will become more regular.

So tell me…moms and moms to be: When did you first feel movement and how did you KNOW it was movement? Was it a few times a week at first? Or was it several times a week?

Thanks!