Welcome to HCM,
You have not mentioned the date of ovulation.
But if ovulation has not occurred till 25th day of cycle, chances of pregnancy
due to sex on 19th day are very feeble.
Sperms can generally survive for 3-4 days only inside uterus.
If clomid is required for ovulation, you are probably suffering with PCOD.
Patients suffering with Poly cystic ovarian disease
have multiple small cysts in their ovaries.
Ovaries become enlarged and produce excessive amount of estrogen and androgen hormones.
Absence of ovulation causes infertility
Many patients with PCOD also have insulin resistance
and have raised level of insulin.
These patients may not respond to clomiphen, thus treated with anti diabetic drugs like metformin
Clomiphen is used to stimulate ovulation. Low doses of dexamethasone
can be given simultaneously to suppress androgen production from adrenal gland.
If clomiphen doesn't work, a new anti-estrogen called Letrozole
can be used.
Clomifen resistant women suffering with PCOD, may need HMG(gonadotrophis) to induce ovulation.
Difficult patients may require a combination of GnRH analog and HMG to induce ovulation successfully.
Metformin can improve your fertility by reversing endocrine abnormality and improving your ovulatory response.
Thanks for trusting Healthcaremagic and posting your query.
Hope you found my response to your query informative and helpful.
If you have further concerns in this regard, you can submit those with Healthcaremagic as well.
With good wishes,