Anthony Bentley, DO

First, you need to be on a regimen of skin lighteners, such as hydroquinone, for several weeks prior to any treatment.  Although there are numerous treatments for hyperpigmentation, I tend to avoid lasers, since the heat generated by the laser could incite more hyperpigmentation.  However, picosecond lasers are theoretically less likely to have this problem.  I tend to recommend chemical peels, ideally containing skin lighteners, followed by a light steroid cream to reduce inflammation.  Remember that any modality will likely require several treatments.

Continue to apply ice as tolerated.  It may take several days for the swelling to subside.  Of course, follow up with your injector if you have any concerns.

Usually, intravascular injection will result in blanching of the tissues due to lack of blood supply.  Your photos suggest typical bruising and swelling that might be anticipated from an injection.  Apply ice to the area as tolerated and follow up with your injector to ensure that you are healing appropriately.

To my knowledge there have been no studies to validate the safety of botox in pregnancy and there is no reason to take that risk.

You should make your injector aware of your concerns.  If they cannot address your concerns, consider a second opinion.