I have already had an staph infection this pregnancy and was on AB for it. I have it when Im not preg either.. anyway some things i do is use anti bacterial soap (from the chemist) and this helps ALOT. When I do get a boil I use Magnoplasm (which is fine in pregnancy) and that draws it out abit. If it helps, i was on AB about 6 times with pregnant last time and DD was fine.