Well ,I think this cycle of yours is delayed.Since you have a sonogram done now which reveals a ovulation, you can pretty well expect a menses in the coming two to three weeks if you are not becoming pregnant now. Well this is the time you must go for a barrier method like condoms,or else you have got chances of pregnancy
.If you don't get menses you repeat the urine test/ transvginal USG again after 4 weeks. If that is negative ,you can consult your doctor for a withdrawal bleeding.
The soreness in the bresats can be premenstrual mastalgia, due to hormonal
effect and you can expect menses soon.