Re: antibiotics and the pill
Indirectly, sure. If there are pathogenic or opportunistic bacteria/protozoa/whatever around to take advantage of the loss of normal flora, then those new bacteria can cause diarrhea.
I apologize for being unclear.....all I meant was that absence of normal flora, in and of itself, doesn't affect absorption of the pill (initial absorption, anyway...later reabsorption and recycling can be impaired, but that just exacerbates the liver metabolism problem). I incorrectly interpreted your first message as meaning that you thought this was the case, since you made no mention of nausea then. Like I said before, I agree with gobbleduck--vomiting and diarrhea, whether you're on antibiotics or not, will affect absorption of the pill.
Since talula didn't mention any vomiting or diarrhea, I assumed that nausea wasn't an issue and that she was worried about the increased clearance of the pill from her system.