My period keeps getting lighter and lighter on the pill

So I keep getting lighter and lighter periods while on the BC pill. Im on Aubra EQ. I used to have realllyyy heavy periods before birth control. The first month of BC, I bled for my regular 5 days but it was slightly lighter. The second month, I only bled for three days and it was even lighter than the first month. I’m now on the 3rd month and only on day 2 and I’m having very very light bleeding. The first day I had brown blood and then red and now I’m having brown blood come out again. Is this normal? Should I be worried/get tested for pregnancy or am I good?