Broken Condom & Plan B

So last night 9/30/17, my boyfriend and I were being intimate with each other. And, the condom broke! Now, I didn’t know this but EVERYTIME we’re intimate with each other everything’s fine. We’ve had this scare before but everything was fine. But, last night the hole was so BIG you’d think he cut it (HE DID NOT). But, he came inside me, no more then 1 hr later I took Plan B. Now my period is suppose to start on 10/2/17. So I’m freaking out of course. Can anyone tell me if I’m good? We can’t afford a tiny human right now, so I’m freaking out in LARGE amounts of stress right now... Any advise would be great!