Thanks for the query.
If you had intercourse around the time of ovulation then there is possibility for pregnancy
The scanty flow you had could be hypomenorrhea
, which can occur because of hormonal imbalance, anemia, thyroid abnormalities etc.
If you want to rule out the pregnancy better to go for blood test
If comes negative, this time you track your ovulation by cervical mucus method or basal body temperature
method or by ovulation kit and plan intercourse around that period which will increase the chances of conception.