BC Body Changes

Hi! So I'm on my very first month of birth control. I take the minipill, because I can't have estrogen. I know that some people spot occaisionally until their body gets use to the new hormones, however I'm two weeks in and it looks and feels like my regular period. Is that normal? Also, (warning this may be TMI) when I first started spotting or bleeding, my blood was very gunky and thick and dry and dark brown. Usually it's a healthy red with dark red mucus like discharge. Should I call my gyne or is this normal?