Month number 10

So I wake up this morning and still no AF going on day two. So I decided to take a test and it a BFN. I get up and get ready for the day and go to the store to buy food for the day and while I’m walking I get that feeling in my stomach and sure enough there’s AF. Why did it have to show up at the store where I don’t have anything with me and make me waste a test. So I decide that today I’m gonna drink all the caffeine I want and buy a ovulation test kit and hope that month 10 TTC is my month.