Movements

Im 17+5 with my 4th and im not feelimg movement, no flutters nothing, spoke to my midwife and she said noone does its usually just wind but i know full well that my others i was feeling wiggle about by now, anyway does this mean my anterior placenta hasnt moved yet? And if that's the case then can be it dangerous? Im so anxious but cant afford to pay for a private scan as i seemed to give birth round the same time and have birthday presents coming out my ears 😂