I'm pregnant. Why are my feet getting bigger?

That's because of fluid retention. Your body will need to store extra fluid in preparation for labour, which is why the feet appear bigger and bloated. http://pregnant.sg/articles/how-to-deal-with-swollen-ankles-and-feet-during-pregnancy/

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As Melissa mention, because of water retention, your feet gets bigger. I bought crocs at about 8 months pregnant, and now that I am 6 months post pregnant, the same shoe is loose on me now

It is caused by water retention mummy but not to worry, the swelling will usually subside after delivery. http://sg.theasianparent.com/pregnancy-concerns-swollen-feet/

thanks