Hi,
Welcome to ehealthforum.
If you had been ovulating periodically, then the unprotected intercourse after your periods could have resulted in pregnancy. The short and light âperiodâ that you had in between could have been probable implantation bleeding. Look out for other symptoms and signs suggestive of early pregnancy. Visit your gynecologist/healthcare provider for a thorough examination and tests to confirm/rule out pregnancy.
Take care.