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to me it's clear cut, once your married:

1. sex with your marriage partner is not a sin.

Agreed.

2. using a condom, the pill, the patch, the rhythm method, or the withdraw method with your marriage partner to prevent unwanted pregnancy is not a sin.

OK, that's your belief. You're not Catholic. No one is forcing you to accept the teachings of the Catholic Church. The Church has a more noble view of the sex act than you do: it teaches that the sex act should always be open to procreation and thus, artificial means should not be used to prevent conception. In most instances, those who practice planned artificial sterility do so for selfish reasons that are not consonant with Catholic teaching anyway. If someone fears pregnancy for legitimate health or economic reasons, they have a perfectly reliable alternative open to them: abstinence.

3. having a doctor take the sperm of the husband and combine it with the egg of the wife and then re implant it back into the wife for the purpose of enhancing their chance of having a baby is not a sin.

Even if the extra embryos which are created and not implanted are then destroyed? This is why the Church objects to invitro fertilization.

Even if the extra embryos which are created and not implanted are then destroyed? This is why the Church objects to invitro fertilization

No, that would be abortion. Any extra embryos would have to be eventually used by the husband and wife for it not to be considered a sin in my opinion.