I'm hopeful....

Victoria • Ttc #1 27 yo married with 2 "bonus" - daughters peace love happiness
I have PCOS and the doctor told me it would be difficult if I were ever to try to have a baby. I started using fertility calendars just before I started my period last month and I'm 5 days late. We followed the "peak days". My worry is that, in the past I would go 4-5 months without a period, and it's only been since November that I've had regular cycles. I'm worried I'm not actually pregnant, since the test I took 3 days ago said I wasn't, but that my body is going back to being irregular again. Ideas or opinions? Has anyone else been through the same thing? I keep praying I'm pregnant but I just can't tell.