could I be pregnant??

Hey ladies. So my last period was October 28-October 31st ( 4 days) I am 18 days late according to eve. I haven't had a November period at all. Still no period in December yet. I took a test today and it was negative.  I last had sex on November 8th and the condom did break and the sperm did go inside of me. I have been having nausea and my boobs have been hurting and I've been having a metallic taste in my mouth for some reason. I don't know if it's to early for the test to show anything or not but I could really use some advice!!