Thanks for the query.
If you had unprotected intercourse
during ovulatory period then there is possibility for pregnancy
But just by scanty flow during periods and symptoms we cannot come to one conclusion.
You better go for blood test
for pregnancy once. Which will give more accurate result.
In the absence of pregnancy your symptoms related to smell and food could be due to psychological.
And these will usually subside soon when you rule out the possibility of pregnancy with evidence.