I have had situations where the local RE (actually nurse) would say this or that and then when I got to Ch.ec.k's office, they'd say something else. In fact, at one time, the local RE said I had five follicles, but when I got to their office the next day or two, I had only one. From that experience, we decided to go to NJ a day or two earlier to confirm the number of follicles. I decided basically that the local nurse didn't know what she was doing. (What was weird was that the local RE changed their practices the next few cycles and the nurses no longer do the u/s there but the REs.)
Waiting until Monday will be hard, but I think the u/s would tell you a lot. See if they come up with the same measurements as Ch.ec.k's office.