Baby moving & in need of advice

What is the earliest you felt your baby move or kick ? How far along were you and what did it feel like ? I'm 15 weeks pregnant with my first baby, and I haven't felt the baby move yet, My doctor said I probably wouldn't until around 20 weeks. But my friend Lexi is only 13 weeks pregnant with her first baby and she said she can already feel the baby moving. It scares me a little and makes me think maybe something is wrong with my baby like maybe it's not okay. It's really been stressing me out, I have an appointment in 2 days and I get to find out what the gender is of my baby, but I'm scared and trying not to fear for the worst. Any advice ?