Good day everyone, yesterday I had an ultrasound and they said it was …

Good day everyone, yesterday I had an ultrasound and they said it was 4-5 weeks. Today we went swimming, didn't jump or do any sudden movements, just floated with a float for about 20 minutes. After swimming, I saw some blood, I thought I wanted to go to the bathroom. But it turns out there is a little bit of bleeding. There's no pain anywhere but my mood immediately dropped to 0! ??Can you tell me if this is a miscarriage?