Scared to take meds!!!

Hey everyone! Me and my husband have been ttc for 3 months now. I am 11 dpo and for the past few days my sinuses have been in a uproar!! Not sure if it is the change in weather causing it. I am afraid to take any medicine because I am not sure if I am pregnant or not. Any ideas on something I could do or take that won't affect anything if I am pregnant? (Fingers crossed)