OB problem!!

Hello mommies ask ko lang po if ang Ob niyo ba ay kusang nagbibigay ng Ultrasound Request or binibigay lang yon whenever you want it? And also does your Ob asked you to get some of test to check your health? Is that a thing po? Im so confused kasi ewan ko lang if ganito ba talaga sistema sa ob check up ngayon na parang everytime na magkikita palaging checking lang with fetal doppler and ang Utz is ako pa mismo mag papaalala at mag rerequest. Given na sa last utz ko is nakaharang sa cervix ko yung placenta ko di po ba dapat chinecheck yunPaano po ba ang system pregnant mom? Btw im 17weeks and 4days still don't know whats going on with my health and my baby #1stimemom #firstbaby #pregnancy #advicepls #pleasehelp