You joined this forum 5 1/2 years ago and did your first SS workout last week? Better late than never, I suppose.
While that level of soreness is more than usual after a first workout, it's not unheard of. Especially if 75lbs was a bit on the aggressive side for your work sets, as it sounds like it may have been by your description of it being fairly hard. Eat and sleep a lot today/tonight and see how it feels tomorrow. I'd be very surprised if it wasn't fine, and you're not able to squat 85x5x3, by Monday at the latest.