Will he get my letter at basic training?

This might sound like the stupidest question to ask but i have been writing my man at basic training for about a week and a half now and just noticed the return address on his letters is different by one letter. Instead of PVT (name) its PV2 (name). what does that even mean? i've just been putting PVT thinking that was right then noticed one of the envelopes had something different. i think the only one i messed up on was the last one i sent where i think i just put PV instead of PVT by accident, im pregnant so my mind has been a little out there lately lately. Anyway, just wondering if he'll get my letters or not. Its like an oops my bad. I may just be paranoid but its been a long time i've written letters you know? i only want to keep him up to date on the status of my pregnancy. Any input would be nice thanks. =)