Dental problems + pregnant!

ln
My tooth is infected and I need a root canal, but my dentist won't see me because of my pregnancy 😥 I'm 7 weeks and he said they won't see pregnant patients until the 3rd trimester. 
I don't think I can wait that long! The pain is so bad and I hear infections can be harmful to the baby :( 
I also called other dentists that accept my insurance, but appointments aren't available for 2-3 months from now!
Is this something I can go to the emergency room for?