Late?

Kayla
Last period was odd. I got it around Sept 15 for the normal 4-5 days. Then came back 2 days later for 2 days. Then same thing again 2 days after. I think stress related. I still haven't gotten my period but getting false tests. 
Odd part...very sore breasts which is not a normal period system. On and off nausea. No cramps like I normally get at this time. More headaches than normal and exhausted very often. 
So with negative tests, should I wait it out or go into the doctor? Any experience on this? For the life of me, I can't remember how I felt during my first pregnancy at the beginning.