 [ Symptoms ] how do i know when a head injury is bad enough to see a doctor  my husband hit his head at work right side lower part of the head its swollen from the middle back of his head to the right ear has a terriable headache took advil and did ok sleeping when he woke up this morning his head was pounding as if he has a migrain not sure if i should worry or let it go as if it was a normal bump on the head how do you tell the difference between a knot or a we need a doctor knot i dont feel fluid swelling is ecactly the same not bigger or smaller [ Disease ] 18 weeks pregnancy is enough to know you are pregnant or not by us or bhcg and your abdomen size …get an us and see your baby if it is there…