You must confirm the pregnancy
first by doing urine test for pregnancy.
If the test is negative you can retest it after a week.
Once the pregnancy is confirmed ,you can use MTP
pill to terminate the pregnancy.
Possible causes for burning and itching are urinary tract
infections which can be confirmed by urine examination.
If UTI is confirmed then you can contact your doctor and get the prescription of antibiotics.
In the mean time ask your wife to take plenty of water by mouth.