I bled for 4 days after my first cervical check. And, I was definitely crampy for at least 2 days following that. But, it's been better now. I've had a 2nd and 3rd check, and my last 2 didn't produce any bleeding and only mild cramping for a day. I hope it gets better for you!
Did they strip your membranes too? I just got checked today and she just felt, she didnt hurt me too bad. I was 3cm too at 35 weeks.