Doppler troubles

This might sound totally stupid, but I was able to find the babies heart rate on Doppler 4 days ago, and I’ve tried every day since and I am unable to find it. I’m currently 11 weeks four days. I found it when I was exactly 11 weeks. Is anybody else having a struggle? When I did find it, I propped my hips up on a pillow, and the babies heart rate was on the left side, just above my pubic bone...Of Course I can’t help but think somethings wrong! I guess this is why I should never have gotten a Doppler in the first place! 😫😰😰😰