9 days late, pcos

Hello Ladies! So, I'm 9 days late with little sign of mother nature coming soon. Only sign is that my nipple is sore but that could also contribute to pregnancy. I was diagnosed with PCOS Aug 2016. I've taken metformin for it since I found out. I recently switched to a different OBGYN because my old obygyn stop accepting my insurance. My new OBGYN wanted me to get blood work and an ultrasound to check on the pcos. Before I got my ultrasound days later, I forgot to mention how I'm late on my period to my doctor at our appointment. As the ultrasound approached, I decided to tell the ultrasound tech about my period. The ultrasound tech said she does not see a baby and that the uterus lining is thick like my period is due. She also mentioned that my pcos is very mild. I've taken 7 tests within like 2 weeks and of course, all negative. My periods have been regular and on time as predicted since I've been taking metformin. This is the 1st time i'm this late. I'm still waiting for the blood test results, which can take up to a week to get back.

Should I make another appointment?

Could I be pregnant and they not be able to tell just yet from the ultrasound and levels be too low to tell on a hpt?