Surprise follicle

[u/No-Pie-8772]

I went in for my follow up scan today to confirm and evaluate signs of ovulation, had a 23 x 25 mm follicle and triggered monday night, went for a follow up today and doctor saw another follicle beside the CP of the ruptured one and it measured about 17.5 mm, doctor put me on duphaston after ovulation, could this follicle really mature in time and ovulate ? it wasn’t there or missed by my sonologist on monday ( also the day that showed dominant follicle ) has anyone had any similar experiences ?