<s>[INST] Hi, My girlfriend and I had sex on the 5th of may, she took plan B the next day, and got a period 3 days later, she was suppose to get it 2 weeks ago but she hasn't. She has just got some brown spots, for about 3 days now. This happened a few weeks ago as well. We did 2 preg tests and they were negative. What do you think is wrong [/INST] HiDr. Purushottam welcomes you to HCM virtual clinic!Thanks for consulting at my virtual clinic. I have carefully gone through your case, and I think I have understood your concern. I will try to address your medical concerns and would suggest you the best of the available treatment options.1]As urine tests are negative you need worry about pregnancy.2] After taking PLAN B one can have some erratic pattern of bleeding; it can be delayed or excessive or minimal ; I will suggest to wait for menses, in view of negative pregnancy tests.3] Last word of caution - use of condom will prevent worry about unwanted pregnancy and will prevent STDs. Please get proper sex counselling done.I hope my answer helps you.Thanks.Wish you great health.Dr Purushottam </s>