<s>[INST] Am having a missed period. My last periods first date is 23-12-2013. I had sex with my boyfriend on Jan 15 and this is my first time and we had unprotected sex. I don t feel any changes in my body condition but not getting my period is starting to worry me. I have a regular period cycle.. I did a urine pregnancy test couple of days back and it was negative. Am afraid to consult a doc, as they mite embarass us, so me and my bf are confused and stressed.. Please advice.. I live in chennai [/INST] Hello, and I hope I can help you today.  Skipping a menstrual cycle is common to many women at least a few times in their life. Your cycle can be affected by factors such as travel, weight changes, and stress... Even stress of worrying about pregnancy. So I think you can be reassured that your negative pregnancy test is accurate. To be extra sure, you may want to retest in one week. I hope I was able to adequately answer your question today and that my advice was helpful. Best wishes, </s>