H E L P . What can i do?

I live in the country currently with my grandparents. The closest dollar general Walmart any type of shopping place is an hour away. There's a guy I've been sleeping with and his car is in the shop. I haven't been able to get a test and my period was supposed to come on the 18 what can I do? I think I'm pregnant but is there any other way I can tell besides a test.