help ...

So I am 15 days late according to this app. My period last month was longer than normal. I want to know if I need to wait a couple more days to test since my other apps say I may start in a week or go ahead and test? I forgot to mention I've had a few cramps and my nipples have been killing me since last weekend/: 
My nipples never hurt when I'm on my period or before. 
I also should mention I had a miscarriage back in 2015 and When I found out I was pregnant I didn't have any symptoms at all so I don't know if this could be something.. I go to the doctor Tuesday to get my left breast checked out again to make sure my cyst hasn't gotten bigger.. should I ask my doctor to test me? 

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