Rasied bbt on menstral cycle

Teri-lyn • 19 F Calgary ab mommy to a three year old minature pincher ttc baby #1 with my bf
Iam cycle day three my period came on saturday but ever since saturday iv had a rise in bbt it went from 98.6 on saturday to 99.1 sunday today its at 99.5 is this normal iam not sick or anything what could it be ? Havnt taken a test yet waiting for my order  to come in