Super super worried

Kailyn
It's been since September 2nd since I've had a period. I had unprotected the 20th, I don't know if he finished in me or not. I have missed my period, I'm very late. I had some chunky super light brown discharge I've never had before a week ago. I took a test, it was negative. Does ception typically take awhile? 
My next guess was going to be my endometriosis causing my hormones to not let me get my period. I am super sick to my stomach, extremely sleepy, I throw up every morning for the past 2 weeks. Please help, currently searching for a new Gyno/ physician. I just need some peace in mind, and advice on the next step to do.