Hi. I read that they are not sure how much of an affect antibiotics actually have on the effectiveness of the pill, if any at all. And if they do it is only in a small percentage of people.
I guess you can't really rule it out though.
I think you should probably be okay. I'm not sure, but the 7-days could include lee-way, maybe. So after 5 days the level of hormones could already be back to normal.
If you are able to get in to see a doctor for the morning-after pill, you could just go and ask them whether or not they see the need for it.
Sorry I can't help.