@toni251
I play a lot of households in my main save. One of them keeps getting abductions. The last time I played them, sims in that household were abducted 4 times in 2 sim weeks. One of them twice. And I got 3 pregnancies out of it. So what you are seeing is not unheard of. Others have it happen too. But for most of my households, abductions are pretty rare and pregnancies from those abductions are rarer still. At times, though, I sometimes think that it goes in streaks too. I'll go a long time without any, and then all of sudden I'll get several in a short period. But I have learned a few things about them along the way.
The odds of an abduction happening are influenced by a number of things. A Scientist that has contacted aliens seems to be more likely to be abducted. A regular sim who has access to the Scientist reward computer and uses the Contact Aliens option seems to be more likely to be abducted. A sim staying in a Focused state for a long time also seems to up the chances of abduction. Having a telescope on a residential lot and using the Search Option that shows up when a sim is in a focused mood also seems increase the chances for having an abduction. My Tech career sims also seem to get abducted more often. There are other things too. But when several of things happen to come together at the same time in a household, you start getting them more often it seems.
There is a way in the game to prevent abductions. Put a sim in the GTW Scientist career and level him up a bit in the career until the sim can make the satellite dish. The dish has an option to prevent abductions. You might have to upgrade the dish to get that option. That keeps the aliens from abducting anyone in the household. You just have to remember to reenable the option every day or two.
There is another option too. Since you already use mods, do you have MCCC? That has options to control the abductions if you want that. You can shut them down completely if you like. You can also adjust other things concerning abductions too with that mod.
Hope this helps.