Hallow Dear, Not getting menses exactly on the expected day should not worry you. Variation by a day or two is acceptable and known. However, you had some brownish bleeding which should not be ignored. Urine pregnancy test is not reliable in the first week after missing the period. It may give false negative results. Best option for you is to go for Beta hCG test. This is a very specific and sensitive test and gives reliable result on even on the day of missed period. If you get week positive results, the brown bleeding will indicate either missed abortion, blighted ovum (pregnancy without embryo in the gestational sac) or ectopic pregnancy which may lead to bleeding emergency. Please report to your Obstetrician to get proper diagnosis with the help of appropriate investigations. I hope this helps you.