accidentally gave too much amoxicillin

Hey! My son is almost 4 months old and has a bad cough, he has a virus and bacterial infection causing congestion in his chest, the dr prescribed amoxicillin, 2mL, but i accidentally read the bottle wrong and the first and second dose i gave 5mL, i feel so bad and i’m terrified that i hurt him. do you think he’s okay? i don’t think he’s acting any different, just sick still. what should i do? what signs do i watch for? i’m literally so scared that i accidentally hurt him or something. please help! 😩