<s>[INST] Hi Sir, Me and my girlfriend had unprotected sex last month and her cycle for this month was about to start on 4th Feb but has not occured till now. We are very concerned if she is pregnant. Please advise on what to do now and how to avoid her from being pregnant ? [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. You have unprotected intercourse history. So yes pregnancy chance present. If conception occurs than after implantation placenta start developing and produce HCG hormone. So if your period delayed for week than investigate with urine HCG card test. If you want to rule out early before one week of delayed period than blood HCG estimation advisable. Hope I have answered your query. Let me know if I can assist you further. </s>