BTW, I was employed by my current company even when they knew I was already pregnant in 2008. This would happen if they think you're a potential asset to them. However, I just left the company because they have changed my role and job duties entirely. I'm in the same position as you now. Let's keep upbeat, never give up!
I also got an interview last week (since I stopped full time work 2 years ago).
I think they are impressed with me but I decided to turn down the 2nd interview as they clearly expressed to me that a lots of OT and politics within the organization.
Like you, not easy to have an interview chance but based on my family situation, I can barely to work on this job even they will recruit me.
Keep it up. I always believe we can find the job as long as we have ability and work passion.