15weeks 4 days!

So I’m currently 15 weeks 4 days, had my first scan 2 weeks ago, all was well, I’m not thin but not massively overweight but do have some extra weight. I just keep worrying about the baby like I haven’t felt any movements yet, is it too early. With my first born I felt he first move at 21 weeks. I’m not a high risk pregnancy and my next appointment is the 6th April I feel like I want to book an early scan like before my 20 week one as I will be 20+5 when I have that scan but I’m thinking to book a private one around 18 weeks for gender and also to just check the baby. What do you all think?