Help please x

My last period was on the 16th August, my calendar shows that im 12 days late (I don’t really take it on that much though as it’s never accurate) but this time round I am feeling abit odd about it as my last period was over a month ago??? I have a few spots that have shown up on my face (but I do regularly get spots) and my breasts have enlarged a little but no other signs that I’m due on soon... I last had sex a couple of weeks ago but I haven’t had any pregnancy symptoms? Can someone help? I’m not trying for a baby at this moment in time x

And I know there’s going to be some negative people that are like ‘just get a pregnancy test bla bla bla’ do you know how expensive they can be? I don’t have a job at the moment and I’m currently broke asf and even so, could this be a medical thing?