Hey mama! Since this is about medicine during pregnancy, please double-check with your OB before using it, they know your case best, and it's always good to confirm, especially sa first trimester.
If your doctor prescribed it, usually they've checked na it's safe for your stage, pero walang harm in asking them directly kung bakit recommended nila sayo or if there are any precautions. A few of my mum friends had similar concerns with prescribed meds, and asking their doctor again actually gave them peace of mind!
Take care, at ingat sa pregnancy mo!