Try not to panic, Bluebelle. I'm sure you and your LO will be fine. It's not like you used it on a large area and the hair in your face is usually quite fine so you wouldn't have had it on for long either. Chances are very slim that anything adverse is going to happen, otherwise it would say something about it in the instructions or packet. I think problems may arise if you use a lot of it repeatedly.
There is so much that us pregnant women are or are not supposed to do that we'd go mad if we managed to stick to all of it all of the time. THe worst is that the advise seems to vary from midwife/GP to midwife/GP and country to country. I have a lot of friends in Scandinavia and some in the US and we've been comparing notes. In the US you are told in addition to shark, marlin and swordfis to avoid farmed salmon at all cost , whereas in Scandinavia they make no mention of swordfish, marlin or shark but warn about halibut instead. And a German lady I know was told to avoid coffee, tea and chocolate in all forms because of caffeine. Here and in the US, you are told that you must not to use a duvet in your baby's cot, while in Scandinavia, it's not an issue.
I've panicked after forgetting about not eating Feta cheese and ready made coleslaw and worried after using nail varnish remover and cleaning products with bleach. The thing is, you do the best that you can and that's all you can do. If pregnancy really is a balancing act on a knife's edge then I think the human race would have died out by now considering what generations of women have done in the past: drank stout, alcohol and unpasteurised milk, eaten dodgy food prepared using questionable hygiene practices, or going back further, worn make-up with lead in it, etc. FAct is, although many more babies died or were miscarried in those days than today, quite a most survived and some even grew up to become geniuses, too!