Anyone keep tracking bbt after bfp? What does it do?

Alison
Some background, been ttc 2 yrs, one mc 7 months ago, bfp again currently 5w3d and I'm nervous, don't want to lose another one. I wasn't tracking bbt with the last, but I also didn't know I'd miscarried till I was at my first appointment with obgyn and suddenly bleeding real heavy. I had some really stressful shit happen this weekend and was very physically active, for me, and I was suddenly spotting very lightly and cramping all day yesterday. I've kept tracking my bbt out of habit and no changes to it at all, cramping stopped and no spotting today, hoping these are all good signs. I have 2 kids and those pregnancies were easy had no issues at all, so this is new to me. Feel like a ftm all over again panicking over everything. Anyone experience this? What did your bbt do during pregnancy? Can I use it as a gauge saying everything is ok?