Heterozygous is better :) (that's what i am too!) ..better as in, less of a problem :)
Don't want to worry you, but since you mentioned about your consultant...I wasn't due to meet my consultant until late on either (actually 18 weeks) ...and we unfortunately lost our first baby last year due to clotting (that's what came out afterwards) at 17 weeks. :(
With this pregnancy, I've been taking aspirin since the moment I found out I was pregnant. They had me in with the consultant at 7 wks, and have been monitoring me since. (but only presumably because of what happened last year, not necessarily because I am factor V, if that makes sense)
It still haunts me that if I had been taking aspirin in my first pregnancy, we might not have lost our child so late on. I'm not a doctor, but my consultant says (if you have factor v leiden) it's fairly harmless to take low dose aspirin. Literally x1 tiny tablet dissolved in water a day. It's most effective especially in early pregnancy at preventing clotting issues across the cord.
Given that you are also flying in two weeks, can you not get a doctor's appointment and ask about taking aspirin just in case? Also, don't forget, it's not a good idea to get too hot/sunbathe when you're pregnant, so make sure you get the shade at midday! :)