depo shot

I usually don't post in here but I figured why not.

I got the depo shot Dec. 22,2017. I started bleeding for almost 4 weeks on it. I decided to not get my second shot in March to let my body rest. on April 20th, I had unprotected sex with my boyfriend. what's the likelihood of me becoming pregnant? and if not pregnant,whats my likelihood of getting a period?