One way is to just let time pass. Embarrassment fades with time. Try to focus on other things and not dwell on that moment too much.
Acknowledge the embarrassment first. It's normal to feel this way. Then, you can take steps to change the way you think about it. Remind yourself that it was an accident and that everyone has embarrassing moments. You could also do something positive to boost your confidence. For instance, engage in a hobby you like or exercise. By focusing on self - improvement, you'll feel more in control of your emotions. And when you see your mom again, approach the situation with confidence. Maybe start a normal conversation as if nothing had happened, and eventually the awkwardness will disappear.
You can talk about it with a close friend. Sharing your feelings with someone who can understand might make you feel better. For example, your friend might tell you that similar things have happened to them too. They could give you some advice on how to deal with the awkwardness, like suggesting that you make a little joke about it the next time you see your mom. Another approach is to think about it from your mom's perspective. She probably doesn't want you to be embarrassed either. She loves you and might be feeling a bit awkward herself. So, you could try to act normal around her and gradually the embarrassment will lessen.