Fingers crossed YG - like others have said - so many things change between now and September. There will be people offered places who don't really want them and are waiting to hear about their other choices. Plus job changes, family changes - all sorts of things. Quite a few got into ds1's class right at the last minute because of people moving or pulling out.
I know you'll worry anyway - I would - but just remember that you stay on that list and just keep calling, regardless of what you hear on March 1st.