Thanks for the query.
Scanty flow during periods is called hypomenorrhea
This can occur due to many causes.
After ruling out the possibilities like stress and strain etc according to you, the other possibilities are nutritional deficiency
, thyroid hormonal abnormalities, prolactin levels abnormalities, poly cystic ovary disease, diabetes etc.
For more details : http://srsree.blogspot.in/2013/11/hypomenorrhea-part-1.html
Generally fertilization occurs with single spermatozoa
. So, though rare, the possibility of pregnancy can not be completely excluded.
So, if you had unprotected intercourse
around the time of ovulation, once go for blood test
If the test comes negative, the possibility of pregnancy is very less.
You can continue with your artificial reproductive methods as scheduled.