Code 3 Stamp?

Hi everyone,

When I travelled to the UK in October, I planned on staying for 5 months with my fiance. However, due to the death of my grandfather, I had to return to the US in November. When I went through immigration at Heathrow on the 10th of October, I was given a "Code 3 Stamp" which after some Googling, apparently means they're "watching me".

As I am going to fly back next Wednesday, I'm really curious how this is going to affect my customs run through. What should I be prepared for this go 'round? Will they be harsher on me? I'm only staying 11 weeks this time... Kinda nervous because of this special stamp 

Thanks for any help!

Kate

Will you be able to bring proof of ties to the US with you when you travel? Proof of a job you're going back to, a lease or mortgage, things of that nature?

I'm 19, still live with my parents so there isn't much in the way of housing. I have pay stubs? Would that work? The officer didn't ask me for proof last time, just where I was staying, my work, my school, the amount of money I had, my itinerary and what not.