Femara - follicle not growing :(

Andrea
Anyone else experience this? Went in for my scan on Friday and I had a follicle that was 13mm..she told me to make sure to BD Sunday night and come back Monday to see what was going on. Today, follicle still 13mm!! It should be growing 1-2mm per day, no? This was my first month on Femara 2.5mg. Feeling so frustrated...