6 week pregnant

Just got home from the ER, so sick can’t keep anything down. They gave me nauseous medicine. It helped a little. They did an ultrasound in ER, measuring 6 weeks couldn’t see much but everything sac etc was in place where it should be, ER doctor stated a small amount of bleeding behind uterus? Anybody had that. I feel like I’ve been hit by a truck how sore my mid body is ???