Honestly, no, I wouldn't be, especially if you've likely just had a scan and all was fine. There is a reason there has been a call to ban these things. Untrained people don't know how to use them and they cause all sorts of problems. In my 1st pregnancy, which was 5 years ago, they wouldn't even try before 16 weeks. This time around, the midwives have already said they won't even try at the 16 week appointment because it causes too much panic when they can't find the heart beat (and even with training, they can't always at that point). I was in the hospital yesterday for my 12 week scan and I had to go to the ward to collect my notes. They sat me down in the assessment unit and there was a mum there who was definitely in 3rd tri and it still took the midwife about 10 minutes to find the heart beat. I would just hand it back to your friend and assume all is fine rather than driving yourself nuts.