Depo Shot

Alyssa
I just had my first injection. I had only been using Sprintec pill for about 2 weeks. I'm planning on seeing my boyfriend tomorrow and we may or may not get jiggy with it. I'm only going to take my pill for tomorrow, then stop. I've been told that the depo is active after 48 hours and others say 24 hours. Do you guys think I'd be safe?