Thanks for posting query.
can be confirmed by a urine pregnancy test only after 1 week after she misses her period. For this, a urine pregnancy kit can be purchased from the pharmacy and an early morning urine sample should be used for this.
If you want to get it confirmed earlier, get a serum beta hCG
done 2 days before she misses her period. A level >10 mIU/ml is suggestive of pregnancy.
Dr Sourav Ganguly