I'm having the same dilemma, but I'm not even pregnant! We had just decided to try for another when I lost my job. Like the poster above, I would feel bad about getting a job and disappearing off on maternity leave soon. I would want to wait a year, but with now trying to find a job, working that year, trying to conceive, carrying to term - at 36, I don't feel I have that kind of time left!
At the minute the plan is to look for short-term work contracts, and keep doing those until (fingers crossed), a due date looms. That way not shortchanging an employer, but am I shortchanging myself? No maternity pay, no job to return to...
Would you take a permanent job, knowing that with any luck you would be pregnant within a few months? As a boss, how would you feel if someone in your team did that? Part of my concern is that the short-term stuff is thin on the ground in my field, but there is some permanent stuff around. Other half thinks i should go for permanent roles, and tell them the situation - let them decide if they want to take me on. I kind of like that plan, but also think that is a very personal piece of information to hand over to a near-total stranger, something even close family and friends don't know at this stage!