Thanks Aoife! I was thinking that it was probably that (just taking longer to get to my goal), but that's ok with me. I'm in this for life and not just to get to swimsuit season, if you know what I mean.
I feel pretty good about my form (I worked out with a trainer for 3 months, so he watched my form pretty closely then), so I'll just keep working and keep being safe in mind.
On to Week 2 of Stage 1!