I don't think this is a big deal. Giselle is eventually going to be step-mom to the little guy some day. Time for Bridget to move on. apparantly nobody told her it probably was not a good idea to get pregnant just when you know the relationship is coming to an end. The timing of the pregnancy sure was ironic. She managed to avoid getting pregnant the first few years. She was 36, her bio clock was ticking loudly. It was widely reported Tom did not want to marry her. She probably went for it. Can't say I blame her, but she made the choice to be a single mom.
I have nothing against TB-he seems like a very decent guy. Him and Bridget were already broken up, and he was already with Giselle when Bridget told him she was pregnant. I do not know how Giselle could stay with a guy who had his ex pregnant. Having a baby with someone is such a personal, intimate experience. You are supposed to have babies with your current lover, not ex.
I would find it very difficult to stay with someone who had his ex knocked up.
I would have loved to be a fly on the wall when Tom told Giselle that Bridget was pregnant.