No period since August

Tania
My last cycle was on August the 7th it's now September 28th and no sign of AF had five bfn and one negative blood test that I did on September 8. After one week after negative blood test took an Opk I had left on 9/18 and got two lines and called doctor and she told me to test on October 10 of AF didn't show up by then she'll do an ultrasound. I been blotted and my Brest are super tender and feel very tiered wanted took this test last Friday. But I don't see anything would love your feedback.