maybe it's true when they say it happens when you stop trying

So we've been trying off and on since 10/2017.. Getting frustrated that it wasn't happening we agreed that we wouldn't focus on it anymore. Now i'm almost 5 days late and have no symptoms of AF at all. Yesterday i got a BFN. I wish i knew if i was going to get AF or if we actually did it this month. I've been thinking that i ovulate a little earlier than the app says just due to past OPKs but again we weren't "really" trying this month so no OPKs. What do you guys think!?