Hi I had my coil removed 9 weeks ago no sign of my period, we are trying for baby number 2, I have…

Hi

I had my coil removed 9 weeks ago no sign of my period, we are trying for baby number 2, I have taken pregnancy tests they have come back negative, this did happen with my son it would only show positive after 11 weeks, yesterday when I'm going to the toilet and wipe it's brown (sorry doesn't sound very nice) what could this be?

Thank you xx