Swollen axillary node. 11 weeks pregnant. also have tiny scratch on armpit near node. should i be concerned?

Keep it clean: Keep it clean and have your doc take a look at it. Could be an infection, but remember that our body naturally fights off lots of infections, so you don't always need antibiotics. Plus lots of infections are viral, so antibiotics not helpful for those either. Stay as healthy as you can: eat right, exercise appropriately, stay mentally strong & positive. Be concerned enought to get it checked out.