So is my understanding that the pregnant client has not yet STARTED care with you - she was due to start July 1st and is now admitting that the arrangement will be short term because she is pregnant?
Cause that is a tough one ... normally I am a I made a commitment I will see it through as long as the other person is respectful and following my contract - however seeing as the mother has given you an OUT and the child has not even STARTED care yet I might be inclined to call her back and tell her you have been reflecting on her call and initially you said it was ok cause you did not want to put her out and you had made a commitment however you have now been thinking about her CHILD and are concerned that a short term care arrangement might not be in his best interest and were wondering if they had a 'back up plan' and that was why she had given you an out - that you wanted to double check that they really WANTED care and that they too were not just going to send him as some sort of obligation? Maybe they have family who could care for that 'short time frame'??? Plus in addition that it would be easier for the program to enroll for Summer/Fall than trying to find someone in the middle of winter because the pool for new cleints tends to be lower.
Good luck in your choice - sometimes it does not hurt to ask more questions and just explain your point of view and find a common middle ground - might be an arrangement that works out for everyone!!!