Tooth infection while pregnant!! straight torturre?

in the very beginning of my pregnancy i was munchin on some carrots wen i accidentally bit into my tongue ring and broke my tooth completely in half. for awhile it was fine until a few weeks ago it started to throb. last weekend i broke into a fever and since then my throat has been sore and swollen and my jaw is aching non stop. i went to my dentist and i need a root canal but he wont work on me due to the high risk of taking antibiotics while pregnant. i am only 17 weeks pregnant! i still have a very long way to go before i can have anything done about this tooth. is my dentist wrong? is this hurting my baby? not to mention hurting my health since the only thing this is going to do is get worse. what can i do?? this pain added on to my everyday morning sickness is driving me crazyy! oh ive also been taking tylenol liquid form to help a little with the pain but all that does is put me to sleep. any advice or help will be greatly appreciated