Friend of mine reported the same, mining around 1.5Ks/s for the same period, total earned less than me, he switched back to Nicehash too.
You should have been able to see the earnings in the graphs on your wallet page over time. Hard to say what you should have earned over that period because the value of each pool fluctuates over time. I think at least on my 2.5KH/s rig it shows that I would usually mine around .008 per day if I only mined equihash.
According to the weekly value for hashing it has had a 22% fluctuation and has averaged .00388142BTC/kH/day. That means it could have been paying as much as .0047353BTC/kH/day down to as low .0031815BTC/kH/day. At least according to my multipoolminer monitoring.
You might want to try multi-algorithm mining otherwise Nicehash will definitely pay a nice flat rate of 80% what you likely could be getting in my experience, but it is absolutely a no brainer to run that. Although even on Nicehash I wouldn't be mining only Equihash.