Cramping after vibrator use?

Stephanie • Graduated from Western Michigan University 14' . Successful and beautiful. Mom to a 9 year old son. Due 1/27/16.
I'm about 8 weeks pregnant and I recently used my vibrator and afterwards I started having cramping pain. Is that normal? ( I have to lay on my stomach in order to finish ) I feel like maybe too much pressure was happening and now I'm scared to use it again :/