I have a large painful lump on the back of my head. May be my occipital lymph node inflamed but not sure. Hx of tick bite, ear infection, 19 weeks IUP?

See a. doctor for evaluation of the lump and appropriate management.
Need exam . You should have this examined by your doctor ASAP. If severe, I to an urgent care center or ER. If it can wait, see you primary Monday. Hope this helps!