Missed Period

My period was supposed to start last Friday (February 20th)
I've had some slight cramping last weekend, but now nothing & no signs of spotting at all.
I have been off birth control for two months, but we've used other contraception. Could it be an effect of being off BC or should I go get a pregnancy test? If so, should I wait until Friday (in case it comes/ so I'm at least 7 days late). 
Thanks for any comments!
We aren't trying to conceive, but definitely a blessing from God's plan if we are!
22 years old & engaged :)

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