I hope you can help me with a couple of questions regarding the above... I have read over many related entries today and learned a lot, but don't think they quite answered everything I need for my own scenario. I really hope you can help!
Since Thursday morning (4th April) I have been on antibiotics (Trimethoprim) for a UTI. I am also on Yasmin, which I have taken at the same time every morning, certainly for the current and previous cycle. I am currently seeing a guy who lives in a different city, and we see each other every two weeks. Last night (Friday) I stupidly forgot about the antibiotics and let him inside me (without a condom) but only for a very short space of time, probably 30 seconds and no ejaculation. I had been so concerned with the idea of whether sex might reignite the recovering infection (and it did hurt, which is why we stopped) that I completely forgot about the drug interraction aspect.
Anyway, I soon remembered, got ultra-paranoid and looked all over the web, including the interraction checker at Drugs dot com (I used that one since the checker on this Livejournal leads to a dead link for me). There seems to be little evidence that the BC will be affected, but I would rather not take any chances.
My first question: Is emergency contraception necessary in this situation? I should mention that owing to various circumstances I will be unable to get to a pharmacy until Monday morning, so just under 3 days after the sex.
My second question is, if the antibiotics have had no effect on the Yasmin (which is what I'm hoping for), and therefore I have the usual hormone levels from the pill, is taking EC a safe thing to do, and what are the possible risks in terms of side-effects e.g. sickness? I have a driving test on Tuesday, which is why I'm so nervous about this. On the other hand, I also don't want to lose my nerve because I'm so paranoid about the possibility of being pregnant.
Third question: I know that if you're on antibiotics you are advised to skip the break and continue to next pack, but does this mean you have to commit to a new full pack, or just an extra 7 days if you want that break at the next safe opportunity? I won't be having sex again until 2 weeks from now and when I do I will be using back-up. But I really want to have my break for the reassurance I'm not pregnant, and also because my body generally hates skipping packs and never lets me get away with it... whenever I've tried it in the past I've always developed horrible PMT symptoms, followed by spotting, followed by full-on bleed by about halfway through the next pack.
Fourth question:This possibly relates to the above, but in case this is relevant, two weeks ago I had sex without a condom. Although I have no rational reason to think my (pill) protection was compromised, in theory (as in, if I hadn't been protected), could it possibly have any bearing on anything that's happening now with the antibiotics?
I apologise for the confusing questions... I honestly would have phrased it all better if I knew how. And I think I'll be insisting on condoms no matter what from now on as everything seems to worry me.