Depo and periods ,

So I got my last period the 28th of dec until like the 7th of Jan but I got my depo shot on dec 2cnd so would it ware if after the 17th ? They say it’s good for three months when should I start the pill?

( I don’t have insurance so I have the mini pill I took like for a week that’s still good so I was just gonna continue that )

Side question

How many of you have sex with out protection with birth control? I get so scared and if I do he pulls out , I bought VCF but do to the reviews I’m so scared to try them 😂😂😂😂😂