17 week check up 😁😁

Savanna
So I had a 17 week checkup today. And she took my weight and my blood pressure, that looked good. But I keep losing weight, even though I keep eating. I eat more now then I did before. Also, it took her a minute or two  to find the heartbeat. It was 135. Which is lower then what's it's been. At 9 weeks it's was 161, and 12 weeks it's was 150 and now it's 135. Is all this normal?