Hi, I had to take Amoxycillian when I was 28 wks due to Sinusitis. As long as it is a catagory A medicine then you are fine to take take it. You can also look up the MIMS website about it to for more information.

Hope this helps. I know how bad blocked sinus is and how hard the choice is to take the meds for it, but you will be so much better off after a few days.