Lack of concentration?

Is anyone else struggling with their head feelings a bit fuzzy or not being able to concentrate properly? 
I decided to plow on with my studies this year alongside being pregnant, 30 weeks tomorrow and I'm still really struggling to retain information & concentrate for very long. Anyone got any tips for studying while pregnant or with a newborn?
(Before anyone starts on the "why didn't you finish school before having babies? I'm 26, married with 3 kids & now a belly, and went back to uni to get my degree in 2015, it's already going to take me 6 years to finish I didn't want to make it 7!)