Thanks for your query.
As you have had tamoxifen
for ovulation induction
, the possibility of a pregnancy or a related miscarriage
needs to be ruled out.
Since you were overdue for 6 days, then please take a urine pregnancy test.
If positive, then the possibility of an early pregnancy or a miscarriage will arises.
This can be differentiated by an ultrasound
Otherwise, this would be a lighter than normal period.
All the best.