Has that thing-that-you-always-get-with-the-problem-that-goes-with-it come back? Can you take antibiotics for it?
Common antibiotics that are considered safe are penicillins (such as amoxicillin and ampicillin), cephalosporins (such as cephalexin), and erythromycin.
Ones you shouldn't take during pregnancy are streptomycin and tetracycline.
There are a billion ones in between that are iffy because they haven't had sufficient studies done on them.
That said, you *should* be getting antibiotics through your doctor anyway so don't be dusting off the shit that sitting in your medicine cabinet that you were supposed to finish the last time. Of course, I would know nothing of this tactic *cough*.
Seriously though, this probably isn't the best time to get all creative with the self-medicating so you really should see someone who knows what they are talking about. If you have something that requires antibiotics, it has to be treated, so throw a tarp over thing-that-you-always-get-with-the-problem-that-goes-with-it and get it taken care of.
search: antibiotics during pregnancy, safe antibiotics during pregnancy