period one day late

Period late but my cycle is quite unpredictable due to pcos
 I ovulated on day 27 & Glow predicted my period to be yesterday on cycle day 41...still waiting. 
I did early response pregnancy tests earlier in the week that said negative which has put me off bothering to do another. 
I don't have any symptoms apart from a sore throat and tender nipples which could be from anything . 
Has anyone else got a positive test result after having negatives ?