Considering work

I have been starting to think about what I am going to do about work..how my current job & hours affect me now and more so further into the pregnancy. My initial plan was to go back to TAFE full time to allow me to complete cert III in child studies, that I had started by distance education but have gotten nowhere - life & work got in the way, but looking at the assistance on offer to me for financial support it seems like it may be not such a good idea right now. I don't want to put myself in a situation where funds are a stretch as they already are at times. So my best option is to keep working for as long as I can, but as I work 3 nights out of 4 this is only going to be practical up to a certain point, I'm already struggling with the late nights a bit now. So I need to try and work out a better solution in regards to my shifts at work and hopefully swap for more day shifts. I have told work that I am pregnant, so they should be more willing to be considerate of me. Seeing as great majority of cashiers employed are women you would think they have to take special consideration for pregnancy needs.