16 weeks and bloody discharge

Sorry tmi post but im 16 weeks today with 3rd baby and i have today started having a brownish discharge no intercourse and due to lockdown haven't over done it theres already problems with baby (cyst on umbilical cord and on baby) so ultra worried i never had anything like this with my first 2 children dont want to annoy the docs if this is normal?!? Any one experience similar?