spotted after fooling around 9 day late period

I fooled around with someone around my ovulation time. there was brief penetration a couple times but pulled right out. he came on my vulvar later. well the next day I spotted for the next 2 days early in the day both days and wasnt a whole day accurance. well now I'm 9 days late for my period which is so unusual. I am under a lot of stress as the love of my life broke my heart back in January and I'm still struggling with that. put I have taken 2 test and both have come back negative. I'm really getting worried. anyone have any insight.