early "period" on birth control

Kelly
I am on birth control and I have been for about a year now. I had experienced what I thought was breakthrough bleeding but the bleeding continued for 4 days. And I had experienced some bloating. I take my birth control every day but the time I take it varies between 12(midnight) and 2:30 am. 
I'm not sure why I am bleeding like this on birth control. I am considering taking a pregnancy test just to rule that out. 
Any thoughts and/or suggestions would be helpful.... 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors