BBT super low

Syvilla • Above all love each other deeply, for love covers over a multitude of sins. 1 Peter 4:8

So normally my BBT is between 97.05-97.25 this morning I took I my temp and it was really low 96.50 I retook it right away because I thought there was no way it was that low and it was 96.78, re did it and same number my question is just is that much of a dip normal?