Last AF started on January 11th...

Alison • TTC #1 for 3 yrs ♥
What's happening to me?? All hpt's are negative :( I've been taking Vitex for the past month (800mg a day) to help regulate me because my periods have always been so weird and so far I guess it's made me late. We also used Pre-seed a few times a couple weeks after my last AF.