I'm 10w 6d and have my first ultrasound next Fri. Been listening to the baby's heartbeat on a home Doppler for a week now. Always been on the lower left...today though I found another heartbeat on the right...about 3 inches across from the first. I'm going to sit later and count the BPM of them both later to try and figure whether they're separate or the same...both definitely not mine though as they're really fast. When I took a test 4 days before my missed period the line came up with in 30 seconds and later on I discovered i'd taken a test that was for use from the first day of your missed period, so figured my HCG levels were already really strong. What do people think...possibility of twins? There's a history of twins in my partners family.