I have done the same when I was about to graduate and started looking. One company started the process long before the others (which all basically followed the same schedule), and gave me an offer before I even had applied to anyone else. At the time I was very afraid of missing out, but the way they gave me only a few days to think about moving to a different city almost a year ahead left a sour taste in my mouth and made me turn them down.

I ended up contacting the company I wanted to work for the most, and said I had an offer. They ended up fast tracking me and giving me an offer as well. So at least the first company validated me and helped me land the one I wanted..