could I be Pregnant?

So according to eve I was mean to get my period on Saturday 3rd it's now Wednesday. 7th and I haven't gotten my period. I also have another app that say I was meant today but it hasn't come yet? 
On the 20th my BF and I didn't have sex but he rubbed me? So I'm not too sure he's hands were dry but idk could I be pregnant? 
So people say to take vitamin c tablets to help make it come sooner.. Has anyone ever taken them? Does it work? 

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