Taking Antibiotics during pregnancy

Amanda
I'm currently 19weeks and I've had head colds my whole 2nd trimester. I just got off a round of amoxicillin twice a day. A week later I'm sick again!😞 they said its bacterial and gave me Cefdinir to take twice a day for 10 days. It's a category B drug but I'm still worried about taking two so close together!! Any thoughts!?