Could I be pregnant??

Madeleine • 21, just here to keep track of all the things, y`know?☺️💕💕
Okay, basically, my boyf nearly came in me last night- don't think any got in, but I can't be sure... My period's due today/tomorrow(ish)- how long should it be before I get worried? Really don't need a pregnancy right now- I'm 17 and haven't had a chance to get birth control yet. We normally use condoms, but I think he just sort of wanted to go in me w/out for a quick try, and idk, I'm just kind of worried that I could be pregnant... Yeah, so how long before I should be worried- and before anyone says, it's very difficult to get the morning after pill where I live, plus I find it far too awkward to talk to my parents about this kind of thing! Any advice would be super helpful, thank you!