Subchronic Hematoma

I had a situation where I was bleeding a lot and I went to the er and they told me they seen where I bleed out at but usually things like this happen and just goes away . I had went to my appointment with my OB and she says I have a Subchronic Hematoma and it is 11.1 x 3.6 x 1.0. They measured the baby he is growing fine and everything and she says my placenta is in the back and the hematoma is by my cervix so I should have nothing to worry about . I am still worried because it is really

Big 11.1 I stopped bleeding that same day and I spot brown on and off but nothing serious . I was 17 weeks when it happen and I will be 18 weeks tomorrow has anyone had any success stories this is my first child and I am still worried even though my doctor says everything should be fine because my baby is growing fine and because it near my cervix .