Prenantals

Hey ladies! My first pregnancy and I was taking all natural prenatals- very healthy and good ones. Unfortunately the iron in it made me constipated so my doctor told me to hold off on taking them until I can use the bathroom! Since then I haven’t started back up on them because they taste SO bad and since then I haven’t had all day morning sickness- besides a little in the morning!! I really don’t want to get back on them and it make me sick but I know I need to take them! Any recommendations ?