irregular cycle after depo

I stopped my depo shots about 6 months ago. I started having periods again 3 months ago and I have had 3 cycles on time. today I am 11 days late, so almost 40 days since my last period. my bf and I have unprotected sex (withdrawal) but we don't mind the risk of getting pregnant since we are so excited to start a family together. the week before AF I had all the symptoms like usual but instead of AF, I had thick white discharge at 1 day late. I took hpt at 2, 4, 8, and 11 days late... all negative. I have had mild cramping for almost 3 weeks now and my boobs started hurting this week. Am I pregnant and still testing too early or is my cycle irregular. P.S. this would be my 4th so I am familiar with pregnancy.