Amoxicillian safe in first trimester?

la

I'm very paranoid taking any meds while pregnant. Of course I've caught everything imaginable the last few weeks (I'm 13 weeks along now), and have to do something to feel better.

Probably have a sinus infection. Dr might prescribe me augmentin but I think that stuff tore up my stomach years ago. Is amoxicillian safe to take? Did you take it and everything was fine?