IVF is a medical procedure which arranges the semen of the husband to mix with the egg of the wife in test tubes under certain conditions to reach to a fertile zygote. This medical procedure by itself is permissible but it should not involve sinful acts like musterbating by other than the wife to her husband or the husband for his wife to take semen or egg, or looking at private parts of any of the couple by outsiders.
No, it is not a sin at all, and I would rather encourage you to be very careful of yourself and such requests.
Nobody can force you to have a child, let alone to give it away. That sounds preposterous.
After you decline, in the case your husband or anyone brings the topic up, or tries to guilt-trap you, inform them very sternly what your view on this is, and if it continues seek consultation.
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