Plus size and exercise while pregnant

Alexia • My husband and I are both 29 yo. We have been married 2 years. Had a miscarriage fall 2015. Trying to have a baby again :)
So I am 4 weeks and 6 days today. I know being overweight can cause complications and being healthier is just better all around. The kicker is that I didn't really have an exercise routine before I got pregnant. Anyone have any easy and safe but effective exercises they have been doing?