Absolutely. Both work in different ways.Be sure you apply the Tretinoin at night as sunlight breaks it down and it doesn't work as it is supposed to.When you visit your doctor, be sure to write questions like this down so you can ask while you are in the office and not have to wait until...
Hyaluronidase usually takes several days to see the effects of the injection and there should be no down time other possibly bruising. Depending on the amount of the filler it may take more than one treatment to dissolve it.
Thank you for your question, and congratulations on the pregnancy. I would not use any product like Botox or any other injectables until the baby arrives, and if you decide to breast-feed, then after breast-feeding.