A vampire walks into a bar. He asks for a glass of water. The barman looks at him strangely. The vampire pulls a tampon out and puts it in the glass.
What's worse than rape...rap.
I can't do better...just realised the only jokes i remember are really bad ones.
It depends whether it was supposed to come at that time, or if you just thought it would. If it was a guesstimate then you could have ovulated late and become pregnant.
Save yourself the worry and use something next time.
Take a test and good luck.