When should i be able to get a positive if i am

Alyssa

So I was supposed to get my period as of Friday on another app and yesterday as of this app. Still not here. I took a test yesterday negative(internet cheepy) . I did have sex on Saturday and as soon as I orgasmed every thing hurt so badly. Never experienced pain like that normally if I have sex the day before my expected period it initiates the process. Today I have sticky mucus.... so I’m not sure what to think of all this if I could be but it’s just not showing up yet.