Prayer answered or Coincidence ?

As a newly converted catholic in the 1990s, when my father needed a serious operation, I decided to have a mass said for him. The operation was due for February of that year and so in early February I requested a mass be dedicated to my father, rather hoping that it would be at one of the February masses. My father was not religious and would not have welcomed or understood this request. I said in prayer, " I know my dad is very anti God but please let me know you are with him " The date of the mass allocated to my father was 26th March of that year. My father's operation did not take place in February - it was rescheduled for - 26th March at 6 p.m - the very time the mass was being said.