Hi, may I answer your health queries? Please type your query here...I had my last period on November 19th. I have regular periods and if I calculated correctly my last ovulation day should have been around Dec.3rd. I had unprotected sex on Dec.9th and took Plan B 70 hours later on Dec.12. I have missed my period and I started to have symtpoms one week after taking Plan B. My symptoms include, cramping, headache, nausea and soreness of nipples. I have taken many pregnancy tests and all are negative. I don't know what is going on. I need some answers to help me. Thank you.