Hi Lucy08 in Seattle, WA,
I am unaware of any negative implications of liposuction on pregnancies in the future. I've had many patients who have become pregnant after lipo and I don't know of a single problem among them - nor do I know of any problems in published literature.
It's likely that there may be some scar tissue as a result of the lipo and that it might feel unusually tight as your abdomen is expanding (particularly if you could compare it to a pre-lipo pregnancy) but the baby will win out (they always do!) and your abdomen will stretch out without problems. I don't know of any reason why lipo should be a problem for future pregnancies.
Two short anecdotes:
One patient who became pregnant after a lipo of her stomach, hips and thighs told me that every other part of her got huge (like her chest) before there was even the slightest bulge in her tummy, and
Another patient had to delay her 2 month followup appointment....because she was pregnant. She actually emailed me her sono instead, labelling it "2 Month Photo."
You look like a good candidate for the procedure if it's otherwise appropriate based on your medical health (if there are any problems there) so you can discuss this with a surgeon who can see you in person without having to worry about the pregnancy issue.
I hope that this helps, and good luck,