help..?

em
So me and my boyfriend have an active sex life and we're 300% exclusive, and I guess sometimes we forget a condom because it's only human to forget some things! 
Now I'm 4 days late for my period but I'm getting a weird aching pain in the V section below my belly which I've had for about 5 days now. 
I'm normally irregular, but what should I do? How long do. I leave it before a pregnancy test is involved? And what do I do if I am pregnant?? 

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