Meditation, Pregnancy and Motherhood

How can I maintain a good meditation practice during and especially after my pregnancy. I took the PSM class a few months ago and have been meditating twice a day for 30 minutes. It’s been going great although lately, especially after finding out about my pregnancy, my mind is pretty scattered and I find it hard to focus on my mantra. How can I maintain my practice and still enjoy it after the baby is born and I will be extremely tired? This is my second baby.