Switching birth controls possibly pregnant ?

I got my depo march 8th and my next shot was June 6th but I decided to switch to the pill recently. At the appointment she told me to be careful this week and I can start today but I already had unprotected sex Sunday are the chances of me becoming pregnant high?! and my second pill is tomorrow won’t start my period pill till mid June, my depo had me on period (some light and heavy spotting ) for like 2 months straight that’s why I thought I was ok but the day I had unprotected sex i stopped spotting.