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Extend partition using LVM

I have Ubuntu 16.04 (no desktop manager installed) running in vmware. I am out of space and am trying to extend the existing partition using LVM. I have added additional space in vmware but am having trouble adding it to ubuntu.

This is the guide I am following:

I am stuck on the part where I need to add a physical volume. This is the command, and output im getting:

root@ubuntu:~# pvcreate /dev/sda3
Device /dev/sda3 not found (or ignored by filtering).

I can see my partitions, but can't understand why its not finding it. Here's the output of my partitions:

root@ubuntu:~# fdisk -l /dev/sda
Disk /dev/sda: 75 GiB, 80530636800 bytes, 157286400 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x277beceb

Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 999423 997376 487M 83 Linux
/dev/sda2 1001470 20969471 19968002 9.5G 5 Extended
/dev/sda3 20969472 157286399 136316928 65G 83 Linux
/dev/sda5 1001472 20969471 19968000 9.5G 8e Linux LVM

I am relatively new to linux so bear with me but if im understanding this, my current 10G drive is /sda5 and /sda3 is the new partition with 65 gb im trying to add to it.