Thanks for your query.
The mild spotting and cramps around day 14 definitely point to an ovulation bleed.
You would be having follicular monitoring and ultrasound
in this cycle, so you easily know what is the cause.
ALso, you should see an Infertility
specialist for your problem, as there are various causes of infertility.
Your basic hormonal
tests, semen testing of your partner, your tubal patency tests and ability to ovulate are some cardinally important issues.
These should be thoroughly evaluated.
THere is no reason in this era of ART ( assisted reproductive technology ) why anybody should be childless. Do not lose hope and keep consulting a specialist.
All the best for this cycle.