Quesiton ! Started vitex

Meg

I started taking chaste berry last cycle . Didn’t get pregnant . I usually ovulate day 12. This cycle ( first month taking vitex through my follicular stage . My ovulation strips have had no lh surge at all. Pretty low the whole time and I’m on day 13 now …. Did I skip ovulation or is it just pushed back ?? Has anyone experienced a longer follicular stage while taking vitex ??? I always have a normal ovulation lh rise and surge so this is very odd. I’m pretty concerned !