late period?

Amelia
So my boyfriend and I had unprotected sex February 11th ... the first day of my last cycle was January 20th ... it is now February 29th and 7 days late. We took take action 6 days sooner 2 days ago when I was 5 days late .. They both came up negative. Was it too early to test? We took both and both were negative ... I also took emergency contraceptive last month & was thinking that's what was making me late this month so I was wondering if anyone had insight? But I'm also on bc and didn't take it on time (skipped days) in January, and just recently started taking it on time?!