Hi and welcome to the site.
Itching that is noticed to come mostly at night is usually not related to an infection. It is more often related to a skin condition. This can be something like lichen sclerosis
. It may be helpful to try first some low dose steroid
cream. The type you are able to buy without seeing a doctor depends on what country you live in. This cream or ointment (for example: hydrocortisone
1% cream) can be used with a light coating on the skin twice daily. If this helps, it is safe to continue a light coating 1-2 times daily if there is any itching. It would be better during pregnancy
to stop the medication if there is no itching. If this is the cause, improvement will be noticed within 1-2 days.
The other possibility is an irritation of the sweat glands. Keeping the skin dry with good air would help. Sometimes if underwear is worn to sleep or tight clothes during the day, the sweat glands can get irritated and itch. Removing tight and especially moist clothing as quickly as possible can help this. Also taking Benadryl
25mg before bedtime can stop decrease the itch at night. Benadryl may come under a different name depending on what country you live in. But it is a common medication and can usually be found easily without seeing a doctor.