Ny wife is 20th week in her pregnancy she still has nausea and now she has got mouth ulcers on toungue what can we do?

Ask her OB?: Many pregnant women find that taking (eating, drinking) ginger helps tremendously with nausea: ginger in tea, ginger root, however you want to take it. Mouth ulcers (and really all such questions) can ONLY be addressed by a doctor who can see and examine the patient, you should take these to the OB doctor not online. Hope this helps.