@VeeDub oh they can take pregnancy tests if they get pregnant without abductions. All you have to do is go into CAS by choosing "Change Sim" on the dresser then go into the preferences thing up in the left corner under the name. It's a part of the traits screen and looks like 3 dots, I think. There you can choose clothing style (masculine or feminine), whether the sim can pee while standing, body type (masculine or feminine) and/or can get others pregnant or can get pregnant. But there is no option to do both of any of those options.
If your sim can get pregnant, they will not get pregnant from abduction that only happens if they can not get pregnant by other sims. So if you make your male sim able to get pregnant and they do, then they can take the pregnancy test. It's just not an option for abductions.