Late Period?

Shauna
So two days ago, glow notified my that I was suppose to start my period... Didn't happen so I clicked late period, now it says it's suppose to start tmr... I counted back to my last period and it seemed to change too? ( not sure if it changed when I clicked late period or not)  
​Anyways faint cramps that aren't really noticeable but are there, extremely tired, slept 12 hrs last night without a problem. 
​Anyways bottom line, I'm trying not to work myself up again ( for the hundredth time) but I am at the same time lol... Had intercourse about two or so weeks ago, give or take...