BBT???

Trisha • TTC #1
I have been taking my BBT since the last day of ovulation. I noticed that my temp went from mid 97's to mid 98's and stayed like that for almost two weeks. I start my period in 4 days and yesterday saw that my BBT has been slowly dropping back to higher 97's. This is my first month TTC #1 and I'm curious if this means I'm starting my period? I am too scared to take a pregnancy test this soon. Thanks.