“but Godly morality does nor consist in avoiding only what is expressly condemned in Scripture.”
I’ve never made that argument. God’s Word contains the wisdom that can be applied to all kinds of things.
... but you can’t just make up things out of whole cloth.
This is the source you’ve put forth to justify your condemnation of preventing conception - a whole cloth argument.
For example, “Thou shall not murder.”
Apply it to abortion.
Apply it to any contraception that results in abortion.
And as a final point, God also gave married people sex as a pleasurable experience, not meant to result in conception every time it is enjoyed.
Side story. Christian neighbor of mine took his son aside to explain sex to him. Kid listened carefully and then said, “...so you and mom did it 4 times?” (They had 4 kids).
I never said that conception is supposed to happen every time you have sex! That's not possible --- it's not the design! Women are designed to be able to conceive about 5 days of every month (that is, sperm can fertilize an ovum if it is deposited in the woman's genital tract during the 5 day "window of opportunity" before or immediately after ovulation.)
That's five days a month, max.
For long stretches, women aren't fertile at all: 3 weeks of every month, months after childbirth if she's anovulatory because of breastfeeding, and decades after menopause.
All those times are of course OK for sexual union, with no new baby possible.
Enjoy!