Here's where I'd pedal on the first page:
bar 2, first beat
bar 4, first beat
bars 5-8
bar 10, first beat
bar 12, first beat
That way, I think the pedal helps emphasise such things as crescendo-decrescendo, intensity build-up, and harmony.
Having looked at the score again after not seeing it for 1 year, I think it's also okay to pedal the way you did. It's just that I prefer the mysterious, intense, agitated atmosphere that, to me, is not achieved when you pedal all the way through the first page. So yeah...perhaps comes down to preference...