I am on clomid, cd 13 had 17.5mm follicle then cd 15, it disappeared, til now cd 18 no fluid yet, but cervical canal slightly opened. Did the follicle ruptured or shrink? Did I ovulated?

I am on clomid, cd 13 had 17.5mm follicle then cd 15, it disappeared, til now cd 18 no fluid yet, but cervical canal slightly opened. Did the follicle ruptured or shrink? Did I ovulated?