Veda mantras can have several meanings; at various levels.

Let's see one example.
Rigveda 1.164.32.

य ईं चकार न सो अस्य वेद य ईं ददर्श हिरुगुन्नु तस्मात्।
स मातुर्योना परिवीतो अन्तर्बहुप्रजा निरृतिमा विवेश॥

The surface-level idea of this mantra is someone who gives birth to many children suffers.

Simply, if he doesn't have sufficient resources to take care of them.
Then they will be undernourished, they will fall sick.
He will not be able to give them proper education.
He will have to see them struggling in life.
When there are many children he will not be able to give them attention.
They may go astray, they may get into vices.
All these are causes of suffering for the father.

This is from the point of view of the father.

Then from the Vedantic point of view.

If he impregnates and does not understand garbha-tattwa.
For garbha-tattwa, you can refer to an Upanishad called Garbhopanishad; we will try to take it up later.

Without understanding garbha-tattwa if a man goes on producing children, he is going to get more and more entangled in worldly life and suffer.

For him, children will become only causes of worry.

Using the same logic, celibates the sanyasis would say that unless you stay away from family life you can't get mukti, moksha.

With the principle आत्मा वै पुत्रः, you are yourself reborn as your son through your wife.

So there is no question of moksha for a householder.

He will have sadgati, place in Pitruloka or Swarga on account of giving birth to a progeny.

Following the principle of pinda, you continue to live for six more generations through your descendants.

So if you enter into family life there is no immediate relief for you.
A thread runs through 14 generations.

That is why it is said that if you commit a sin, your forefathers in paralaoka will have to suffer and your children and grandchildren will have to suffer.

There is a completely different meaning also.

This mantra is not about pregnancy.
It is about rain.
The rain clouds only know how to rain.
They don't know how they are able to rain.
That only Indra knows.
Only Indra knows the principle behind rains.
That he has to evaporate water from the ocean, bring it to the sky, form clouds, and with the help of the wind move them about and cause rains.
The term nirrti in all the earlier explanations meant sorrow but here in this explanation nirrti means bhumi.
See the vast difference.

From the gross to the subtle.

Which is correct?
All are correct.
This is about the meaning.

Now take the mantra:

दधिक्राव्णो अकारिषं जिष्णोरश्वस्य वाजिनः।
सुरभि नो मुखा करत्प्र ण आयूंषि तारिषत्॥

The same mantra is employed for different purposes.

As per Maitryanai-Samhita, this mantra is used to paise Agni in agnihotra.
In the yajna called agnishtoma, it is used while partaking curd offered as ahuti.

In ashwamedha when the yajamana-patni gets up from the venue, she says this mantra so that the other ladies of the house are also benefited from the results of the yajna.
Same mantra, but totally different purposes and results.

There is a beautiful analogy for this.
The performance of a racing horse depends on the skills of the rider as well.

Mantras are also like that.
They have infinite potential to manifest and enlighten.
But then it depends on your capacity and skill as well.