Welcome to HCM
This is Dr Suchda , NATUROPATH - HOMEOPATH- MAGNATOTHERAPIST going through your query to help remove your problem . I can under stand your Concern & worry is that 'even after 16 years of your marriage, your wife could not conceive IVF treatment also failed . Though it is matter of concern ,even then I will suggest you to have patience & take care of your physical as well as mental health as well as your wife's .
To increase the chances of conception, IVF should be done at least 3 times.
The chances of conception are 25% to 30% first time, 30% to 45% second time and approximately 60% third time.
Before that ,I want to suggest you as Below , if it helps
Both should do few Yogic exercises daily-- Do butterfly , Kandharasan , Pavanmuktasan ,Dheerg - Noukasan ,Gomukhasan , Bhujangaasan Shalabhasan till Conception . Balasasan for 4-10 seconds in between every Asan in essential to recoup & 5 mins Shavasan for rest .Take Guidance from expert if any doubt .
Also do pranayam -Inhale -hold -exhale - hold deep breathing , Kapalbhatti don't ever over do . Keep Calm and don't take unnecessary tensions .

Include in your food , Vitamin E in the form of almonds ,eggs ,fish oil . take wheat , black gram , almonds ,eggs ,fish oil , ginger , ,lettuce ,radish cooked with leaves ,milk,refined butter, mango , melon .
Out of these , take as many as you can in a day . some of these you include in BF , some of them include lunch and some in dinner .And
,take water prepared in copper glass twice every day . fill water in copper glass and keep over night , drink it in the morning . Again fill and keep it for 12 hours and drink in evening ,
Carry on this regime for 3 month or so .

Lady to take Homeopathic Medorrhinum 30 / 4 pills daily for 4 days / after that Weekly for 6 weeks you will see the result . God willing . Leave rest to god

Keep your specialist aware of situation now and then .

Don't hesitate to get back if have any further query

All the best . God bless you