Welcome to the forum and thanks for your confidence in our service.
The HIV combo test (also called duo, combi, and 4th generation) is conclusive at 28 days. And test results always overrule symptoms and exposure history. The sexual exposure you describe may not have been especially high risk (few Moroccan women have HIV), and your symptoms are not typical for ARS (as you seem to know, absence of fever is against it). But even if your exposure had been high risk or your symptoms typical, the test result rules: you were not infected. Finally, I am confident that labs in Saudi Arabia use standard, reliable tests -- probably the same ones in regular use in the US and western Europe.
To your specific questions:
1) You can safely resume unprotected sex with your wife without putting her at risk of HIV. However, having had (partially) unprotected sex, you might consider testing for gonorrhea and chlamydia, if not yet done; and perhaps a syphilis blood test as well.
2) No additional testing is necessary.
3) 99% is a conservative estimate. Most experts consider the combo test 100% conclusive at 4 weeks. Below is a thread that goes into more detail about the reliability of HIV testing.
http://www.medhelp.org/posts/show/1891685
I hope these comments have been helpful. Best wishes-- HHH, MD