Ahh okay, its so hard and confusing for you when you dont track anything (I don't). Me and my OH have only just recently decided to casually try for another baby, and im getting all the signs and symptoms but not sure when I ovulated so its pretty tricky knowing when to test etc. If it happens it happens lol..
What symptoms are you having? ALOT of pregnancy symptoms are also signs that your period is coming (which is very frustrating).
How short was it?