Pcos diagnosis

So my doctor just recently diagnosed me with pcos my only problem is she’s only going off that I missed one period and have a little facial hair(always had it). I’m wanting to get a second opinion just because I was tested for it in late 2016 and my blood work and ultrasound was normal. The blood work I got back is way better than it was in 2016 still in the normal range. She didn’t want to an ultrasound because she said she was 100%. I just gave birth in July and I’m thinking it’s something else causing my periods the way they are.

Has anyone else dealt with this before?