Heart rate

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So I’ve had 4 previous mcs.

I had bleeding at 6 weeks so assumed the worst.

I went for an ultrasound at 6w 6d and was measuring perfect with a heart rate of 148.

Since then I’ve had brown discharge so I went for another ultrasound a week later and am measuring a head by a few days so I’m currently 8w1d with a heart rate of 170bpm.

Does anyone know what the brown discharge would be?

And has anyone had a miscarriage with a high heart rate?

This is also my first pregnancy taking progesterone suppositories and clexane injections.

Thank you