HOW LONG DOES IT TAKE TO NOTICE A CHANGE IN THE BREAST...IVE HAD SEX ON TUESDAY NIGHT N TIWCE WEDNESDAY NIGHT...THEN THURSDAY MORNING I HAD A BROWN MUCUS IN MY CERVICAL AREA .SINCE THEN I BEEN HAVING LOWER BACK PAIN, MY TUMMY FEELS WEIRD...ITS ONLY DAYS OF 4 OR 5..I THINK I MIGHT BE PG...HELP ME OUT IVE NOT GOT A PREGNANCY TEST YET...