Ay, anak, this is definitely something to clarify with your OB directly, she knows your specific situation best, kaya follow her instructions muna! Different moms I know have been prescribed it differently depending on what their doctor recommended, so there's probably a reason she suggested oral for you. If you're unsure or worried it's not working, just send her a message or call the clinic, hindi sila maiinis, promise! Moms here do ask their doctors these questions all the time, and it's totally okay to double-check. You've got this, ate!