Fast rising hcg and a bicornuate uterus

So I went to the er room Sunday for cramping (found out thankfully it was just my cyst on the left side) nothing seems to be wrong no bleeding, no nor cramping and thankfully my hcg is rising. Today my levels should have been 1250 but on Sunday my levels were 3630 is it possible I have multiples? Also I found out I have a bicornuate uterus which can cause preterm labor anyone else have this type of uterus if so did you make it full term??