Festivities are to enjoy and for a pregnant women it becomes more of a responsibility that she takes care of her and of unborn baby's health.
If you're pregnant, then you must have been hearing this a lot, "Don't eat this, Don't wear such heavy jewellery, Try to avoid the colors (during Holi), stay away from crackers smoke etc”
Hearing all this it seems that your pregnancy is being a spoilsport in your enjoyment; don't let it be. Instead be cautious about few tips and you'll be enjoying the festivities like all others