i had sex with my bf last jan.2,my 1st day of my last period was last dec.26.i am always four days ahead.suposedly my next period was last jan.22i still dont have my period.does this brown stain on my undies a sign of pregnancy?i had this stain last jan.16 and last until jan.21.does taking antibiotics can also cause this stain?i took antibiotic last jan.16 until yesterday..hope you could help me.

well....you could be pregnant. about five days after i had my period i had sex with my boyfriend at the time and i ended up pregnant even though we wore a condom it broke
i did not find out i was pregnant until 5months after becausei was havin light periods and such
please go get a test (clearblue digital is the best) and got ot a family clinic.