“Any Medical Professional Should Explain This Transvaginal U/S Scan, Please”

My wife went for a blood test in 2 different labs and the result from both centers indicates She was pregnant. We did a scan but the scan did not see She was pregnant, we were then advised to do Transvaginal U/S scan. Our next appointment with the doctor is next week but She is not at peace at the moment. Pending the time we see the doctor next week, Pls any medical practitioner should explain what the statement of result mean