Cosmetic Botox and Fillers are usually delayed until pregnancy and breastfeeding have been completed because there are no studies performed under these circumstances to assure safety. However, it is highly unlikely that your child will incur any harmful effects at this point.
It is highly unlikely that your Botox treatment had anything to do with the swelling of your lip. I'm glad to hear the swelling is improving, but the cause would not be related to the injections between your brows.
Excellent question. Thirty four units seems reasonable for the areas you had treated. Depending on the patient and their anatomy, some may require less and some may even require more. As times goes on and with repeated treatments, you may not need as much botox to relax the muscles.