Between 7days to two weeks. It is usually written in the leaflet of drugs.

itchy gum could be a symptom of a child about
to cut the first set of teeth. Pls do not
give teething mixtures. You can give
her soft teething toy to bite on.

You can start deworming at 1 year old and repeat every 6months. There are different types of deworming drugs. Albendazole is a good choice. The dosage should be given to you by the pharmacist based on your child's age (200mg /400mg; 200mg for children below 2 years

1) For Vomiting/Nausea, it's very typical in the first trimester but it reduces other time. Try to avoid food with too many seasonings and Vegetable oil. Try biscuits or tom-tom after meals. Food with fibres also helps. For discharge, does it smell, if it does, or it's getting too worrisome? You need to see a doctor asap