So I had sex with my boyfriend, we used a condom but I'm not on the pill (although definitely will be after this), the condom didn't break or have a hole but my period is almost a week late

I have no other pregnancy symptoms except for sore boobs which I usually get before my period, but it hasn't come yet. I know stress can delay a period and I'm hoping its that because I've been crazy busy and stressed. This month, I've gotten my year 12 results, had to change uni preferences, got a new job - I haven't worked before but I get so many shifts and they're always busy! I've also been dealing with some personal issues, recurring depression. I can't afford to be pregnant, I want a child but not this way. This is really stressing me out