Hi Julia,
I had a really bad infected tooth while I was pregnant... I think i was in the 2nd tri but I went on the amoxylin for a week to get rid of the infection in my tooth... I ALWAYS get really bad sinitus infections too but I was lucky enough to not get ANY while I was preg.. it was just that manky tooth.
So yeah the doc told me and prescribed for me the amoxylin, they are ok during preg.... My little man was born long and strong as an ox so they didnt harm him in any way

Good luck mate and I really hope you feel better... I so know how you feel and it sucks!!

xoxoxox