"Non prenatal" Yoga while pregnant??

Madeline • I'm 26, husband is 31. We've been married 6 years and had our first baby 7/15/16 and are now due again 4/17/19
I REALLY miss my yoga class and want to go back but it's not a prenatal one... Are there just specific positions I should avoid? Can I still go to the class I used to go to and just listen to my body??