Running again

So it's really crunch time now, my next half marathon is Nov. 23rd, so it's really time to start training again.
I do my long runs on Sat. mornings, so I went out yesterday morning and I wasn't really feeling good, I had a sore throat and was kinda stuffy so I didn't really have great expectations of how the run was gonna go. plus the week before I was supposed to do 6 1/2 miles and didn't quite get there, only did 4 1/4....
I get to the 2 mile mark (I had to do 7 that day) and I look at my watch and my time was 19:44!!! less than 20 minutes, that's less than 10 minutes per mile! so I was psyched about it so far. I kept checking my watch and I wasn't really staying at a 10 minute mile but definitely less that 11 minutes per mile. When I got to what I consider 5 1/2 miles my time was 58:30, still doing good, better than my 5 1/2 mile run on Weds. so I'm still excited about it, but I still have a mile and a half to go.
So, at the end of my 7 mile run my time was 1 hour 19 minutes, which makes me think my run was more than 7 miles, I know I slowed down the last 1 1/2 miles but could it really have taken me 21 minutes to go 1 1/2 miles!?!?
the course that I run on is marked every quarter mile, but it's only 2.4 miles long, so it gets a little confusing for me what to do about that last little bit.... and then there's another part that only the first 1/2 mile is marked and then it's a little bit longer, so I don't really know how long that is..... so I just kinda estimate....
but for the most part I'm very happy with my running right now, I have been complaining about how slow I've been running lately, but the last two runs I had were very good pace, I just hope I can keep it up, and that my body doesn't rebel against me!!! but I seem to be right on track to get my mileage up by race time, and hopefully my time will be much improved over the last one!

Wish me luck!