This is my first pregnancy and I am rehsus negative not sure what blood group baby is yet, I am 16 weeks today and 2 nights ago I walked into the door frame and bruised my lower abdomen and it is tender to touch, I rang my midwife and she wasn’t concerned at all -my question is if you have a bump and your blood mixes with baby does it affect this pregnancy or just any pregnancies going forward?! Thanks !!