Antibiotics and flu when pregnant!

Please help! 
I found out a week ago today that I am 4 weeks pregnant. I am so happy about this as we were trying for a baby. 
I just remember about I had a bad case of the flu and a chest infection! At this time I was taking painkillers and antibiotics I would of been about 2 weeks pregnant at the time although I did not know. I found out the antibiotics were safe for pregnant women but I stopped taking them anyway I'm now afraid that something happened to my Baby during my time of the flu. I continue to get pregnancy symptoms and still positive tests all round! I'm just worried sick now that I'm going to miscarry :-( can't stop crying ..