Well I came off the pill in Feb for the first time in 10 years too. I got UTD the very first cycle although it seems my cycle was a little longer than the standard 4 weeks which made things difficult. It wasn't until just over 5 weeks since my LMP that I got my BFP. I had similar symptoms to you (the main ones being the sore and swollen BB's and gassy). Unfortunately for me I had a miscarriage not long into that pregnancy.

Anyway, I guess what I'm trying to say is yes, you could be UTD but perhaps it is too soon to tell yet. If you can, hold out for a week or so and then test again. Good luck!