8 days late. No test yet.

Hi all,
I came off the pill about a year ago and since coming off the pill my periods have been really regular. 
Except last month I was 9 days late but my dad had a heart attack and I only got my period 2 days after he came out of hospital so put the last one down to stress. 
Last period was 31/12/15 lasted 7 days. It's now 11/02/16 still no period. 8 days late now. Haven't tested yet. Was going to wait until I'm at least 10 days late. 
Woke up this morning and my boobs were so sore! Looked in the mirror and they were so swollen. Seems to have gone down now but still Alister tender. Is this a sign AF is coming or should I test sooner?