advice/opinions wanted!!!

so tomorrow, 12/18 will be 6 days from a missed period. my boyfriend and i have been together since April 2017, got engaged 12/4. ive never missed a period since i was pregnant with my first son, from a previous relationship, back in 2014.

Before i knew i was pregnant with my son, i had my period then 1-2 weeks later i took a test on a whim and found out I was 11 weeks, 3 days pregnant.

i was diagnosed with PCOS when i was 16, Im 24 now. my periods were always irregular until i got pregnant. after i gave birth, my periods then became regular, until now.

my fiance and i have been kinda trying for a child, he has no children of his own. im nervous to take a test cuz i have taken tests in the past and they've came back negative.

should i continue waiting to see if i get my period or should i take a test?? i would like to know before christmas cuz if i am pregnant, i want to do a big reveal for my fiance since this is his first baby. what should i do??