I don't know why you couldn't. Or why I apparently need to know the answer to this as I am neither pregnant nor have I been waxed recently.
I got waxed a couple of times while pregnant. Towards the end, I found a waxer who was experienced with pregnant women and made sure to take tylenol. It hurt less than other waxes I'd had.
I think if you do it pretty regularly not pregnant (I usually have it done every few months, so not even that often), you should be fine.