pregnant and bleeding

J
I'm 6weeks and 3 days pregnant, due December 18. I'm also 18 years old. And for the past 4 days I've had some spotting / bleeding on and off. I went into the er last night around 10:30 and they did an ultrasound and seen my babies heart beating away normally, I also have a follow up ultrasound today at 3:50 but I'm not sure if this bleeding is just a thing that's going to happen for me or if it's something more serious? The fact my babies heart is still beating is really good but the bleeding makes me worry. I've got thrush which I was told to use a pessary to treat and ever since doing that the bleeding has become a little worse and more obvious, I'm not sure if it's just inflammation causing bleeding. 
Just wondering is anyone else has experienced this 😣