NO! Bajoran's have secreted away vaginal pouches that store sperm for when there are no Bajoran men attractive enough to mate with which is most of the time so that the race won't die out and since Seska is a perfect Bajoran replica she uses this for her own ends.. but it fails. Because either a. she was already pg with the Kazon child or b. Chak's sperm didn't work. Unfortunately the secreted away vaginal pouch does not contain equipment to measure motility of sperm.
That's Peacekeepers. Peace keeper girls can hold fertilized eggs in stasis inside themselves without help from technology for up to seven years.
Such a male fantasy. "My sperm is SO wonderful that women will want to keep it inside them for seven years!"
Such fantasies would seem necessary in Chakotay's case, to preserve his self-esteem and keep it somewhat intact. Behold! How Seska just ... helps herself ... to his DNA, like so many ripe, juicy berries waiting to be plucked out of a bush! So like a woman to be that selfish and vain - not even thinking of the Man's needs!
There's a joke I heard Les "Barry Humpfries" Patterson tell so long ago... "I have stains on my trousers older than most of the countries in Eastern Europe." Then there's something from the Odd Couple (the TV Show) 9 year old niece is contemptuously holding up a floor mat "How did you get this disgusting blue stain on your brown rug?" Oscar "Huh? No, that's a blue rug."