I had the flu during my pregnancy and it was miserable for me, but my son is just fine. Glad you were able to take something that helped with the symptoms and that you are feeling better. Don't worry about the little one, it's pretty unlikely it harmed him/her in any way.
Worrying about it is harder on the babe than the actual flu. I've had the flu and such during past pregnancies and all my kids are fine...lazy adults/teens, but fine. lol
Stop worrying about it and you'll both be fine. : )