Darker discharge and small cramps while on the pill?

✨Elizabeth✨ • 20, college med student
I got my period on February 14th (go figure :p) so I started my first pill pack ever that day of birth control. My period ended after about a week, but I have been having brownish red discharge and a small cramps ever since. I've been taking my pill every night at the same time and am on week 3. What could this be? Is it normal?