Please help !? Bbt chart

Courtney
I got a positive opk on cycle day 18 , and I don't feel like I ovulated . The test strips have been positive for 4 days now. I'm wondering if there's something wrong with me, because I know I didn't ovulate last month either. I got an ultrasound when I should've, and the technician said my follicles didnt mature. Is that why my bbt is always looking like this ??