After my 1st visit I found I had an infection (not that kind) and the dr gave me something, but like you I wanted to wait, turns out the next midwife I saw liked the fact that I waited, all doctors are different in what the reccomend, if you don't feel comfortable right now, wait, at your next appointment let the dr/midwife know you didnt take it, and your concerns. Since you will be closer to your 2nd trimester you will feel safer taking it.