I'm looking for Japanese pregnancy videos from the 80's/90's and early 2000's. Please and thank you!

There is someone else trying to find some specific titles from that vintage. The short answer is that anything from before the DVD era is rare; much of it wasn't rereleased on disc and almost none of it has been digitized by anyone who had a copy. The existing tapes may be in poor shape so even if you do find one in a closet somewhere there's a decent chance it's decayed and unviewable. You might find a laserdisc if any of them were released in that format though you have to go to the trouble of getting an LD player. You may luck out, but the only way to find some of these is likely to find a bunch of old porn shops in Japan that never threw away their videocassettes.