Should I track BBT?

Brittney • I`m 32 years old and have a almost 2 year old son (bday 9/3) and pregnant with our little girl (due 10/4)
Do you just use a regular thermometer? I'm new to all this! I've been using OPK's and doing CM checks the past 2 months but have not monitored my BBT yet. Should I? I am retry confident about when I am ovulating....