Oh I really feel you on this, it can be such a stressful time and it's completely okay to want to know what to expect before taking it. From what I've heard around, the most common things are cramping and some irregular bleeding, though experiences really do vary, some people sail through with just mild discomfort, while others have had quite bad cramps and even nausea for a day or so. My friend went to a GP here in Singapore and said the doctor was actually quite thorough, asking a few questions first to make sure it was safe before prescribing it, and walked her through the side effects, so if you can, going through a doctor rather than just buying it over the counter is worth it for that peace of mind. One thing worth knowing is that it's not 100% foolproof, so do follow up with a pregnancy test if your period is late, just to be sure.