I have a regular cycle this month it came very early day 20 started off brown then red and towards the end brown but it seems to not completely stop?

Completely regular: ...cycles are more the exception that the rule. You are lucky to know precisely when you're getting your period. Stress, getting sick,, weight changes, heavy exercise and many other factors can affect a woman's cycle. You might not have ovulated this month--that can also throw your schedule off. If the problem persists, see your Gyno, but, otherwise, no worries! Dr. Anne