My son (my first) I started feeling flutters at 15 weeks! Im 25 weeks pregnant with number two now.. & didnt start feeling her till around 20 weeks. Found out I have an anterior placenta & thats what caused the delay.
I felt my sons first movements around 15 or 16 weeks... with my daughter, I didn't start feeling her movements and knowing "for sure" that it was her until I was at least 22-24 weeks along. I found out I had an anterior placenta with her early into my second trimester. My dr couldn't find her heart beat with the doppler... it was concerning to him because he could usually find it at that point in pregnancy. Ultrasound revealed she was nestled up behind her placenta. lol
With my first the placenta was off to the right, and slightly forward. I don't know if that affected my ability to feel him move or if he was much of a mover but I didn't feel him moving until 22 weeks, my second I felt at 11 weeks, it felt as if someone was giving my belly butterfly kisses. I'm 12 weeks this time and so far I've felt nothing but gas, so, it's different every time.