Okay so I just finished Bactrim for a UTI & now they put me on a zpack for a sinus infection. I…

Okay so I just finished Bactrim for a UTI & now they put me on a zpack for a sinus infection. I always feel guilty while taking medicine. This is my 3rd round of zpack since getting pregnant.. I freak out every time I take it but the dr says it's better to take the medicine than let the infection stay in my body and harm baby... I just hate the always feeling guilty part of taken it :-(