Can anyone explain this please? (Late period)

So basically, me and my boyfriend had sex last Saturday, and he always pulls out and I'm on the pill, but a bit of his erm, stuff, went near my lady garden.. Not even in it just near it, and I'm very over the top, even though I'm on the pill I went to get plan B with him. Took it basically a hour after we had intercourse and I was fine. I was meant to come on this morning (Tuesday) and I haven't.. And I'm panicking 😂 I get very anxious about this sort of stuff and Id usually start my pill again tomorrow (the day after I start my period as I didn't take it for a week) and id have a week long period. 
But what's getting my confused is that I've not come on, so do I still take my pill tomorrow? Why haven't I started my period yet? I'm very confused and it's been on my mind all day.. 
If anyone responds then thank you!