I need help

Emma • Mum to 2 handsome boys & a beautiful little girl. Trying for baby No4

I'm 38 weeks and 5 days pregnant. everytime my baby moves I have pain down below. I have had grown scan and the baby is 8 lbs already they want me to have a sweep next Wednesday when I see my midwife. just wondering if the pain I have been having is the baby moving down more ready to be born. please help thanks.