There is little you can do until the rain stops. If the sand bed under the liner isn't visibly washing out you're probably okay. But at this point, you can't know until the rainwater has drained away.

Here's a bit of a horror story: Our AGP is set up against a hillside. Just as it had been filled the rains came, and I mean downpours of such magnitude that we couldn't see the neighbor's house across the road. Water came gushing down the hill and washed out most of the sand. The builder had to drain the pool, remove the liner, add sand and regrade it and basically start all over again. That time he got proactive and installed a . . . hm, now I forgot what it's called . . . a 4" diameter black flexible pipe with holes in it around the back of the pool by the hill, and then packed dirt up against the pool with an upward slope. We haven't had such a rain since, in 7 years, but if we did, in theory the water would be diverted away from the pool and any that soaks in would get into the black pipe.

The ground where the uprights sit on the blocks should also have been compacted; in all likelihood you're okay.