Alam ko na ang graveyard shift sa call center is super demanding, lalo na kapag pregnant ka na, ang commute alone, plus the stress, nakakasira talaga sa katawan mo. Yes, pwede kang mag-request ng medical certificate from your OB, and most doctors will give one kung makikita nila na ang work setup mo ay risky para sa pregnancy mo (like ang dizziness at nausea mo). Best move is to talk to your OB about your symptoms and work situation in detail, tapos i-explain mo rin sa HR na may medical grounds, maraming companies have maternity benefits or early leave options, so worth exploring din yan.