Squats are one of the best exercises you can do while pregnant. It will help strengthen your lower body and open up your hips. The wider your stance the more it will target the inner thigh
The second exercise is the lateral lunge. This is probably the most effective exercise in targeting the adductor muscles.
Instead of stepping out laterally, you will step behind your other leg. This will also strengthen the quadriceps and your hips.
This exercise is great to do during pregnancy & the postpartum period as well.