Threatened miscarriage

So scary!! I had my first apt on Tuesday and they did a pap. Well my bleeding from the pap got heavier till today when it looked like a period and bright red and started cramping. I am supposed to be 9 weeks according to my last period but the ultrasound at the ER estimates around 5 weeks. I ovulated October 11 so it makes sense. What doesn't make sense is why I had a very long 35 day cycle instead of 30. So now we're back to 6 weeks and have to take things easily.