The permanent ... a yes under surveillance
Being pregnant does not prohibit the permanent. Nevertheless, the influx of hormones often modifying the nature of your hair, you must be careful. No way to do it yourself. Only the hairdresser is competent to choose the product according to the desired effect (light volume, small or big loops) and especially for you to refuse it if it considers that your hair is too damaged to support this chemical aggression. The perm tends to dry the hair, it will be rather beneficial to oily hair.
Small precision: if the perm does not "take", it will not be because of "your hormones" or the fault of the man of the art who will have tried. This unexplained phenomenon is not only rare but it has no connection with pregnancy!