for muslim mothers who are fasting!

salam ramadhan! im 29 weeks pregnant & tried fasting the first day of ramadhan only. tried fasting after that but was feeling giddy, hungry & fast heart rate. i also have gdm hence i decided not to fast. may i know how do i pay back my fast? is it only by fidyah? or both fidyah & qadha fast? its quite confusing bcs i see different answers 🥲