can I get pregnant?

I got my first depo shot a month ago the 23rd. When I got my depo shot, I was on my period so apparently it was “immediately affective” but I was still told to wait a month before it is affective & I did.

On the 28th, me & my boyfriend had sex, used a condom, & it broke and he definitely came in me. Is there any way I could get pregnant from this?? Also, I don’t need to get my next shot until around November 20th but on the 9th I am getting nexplanon & switching my birth control. My question is, since I had sex & he came in me the 28th, will I get pregnant if I don’t get my next shot in November even when I get nexplanon the 9th of this month??