Does being plus-size automatically make you higher risk?

Ashley • TTC #1 - Married 8/16/14, MC 3/4, CP 4/10
I am super interested in having most, if not all, my pregnancy care handled by a midwife, but am wondering if being plus-size automatically makes me higher risk. I do not have any health conditions other than a slightly elevated tsh (for which I'm going to an endocrinologist next week).