i was really worried about my traffic in the last few weeks only had 0-2 visitors a day but on 28th of jan i got 20 visits on 29th i got 42 then on 30th i got 58 the only thing i did which could get traffic is stumble upon! but.. stumble upon only gave me 16 visits and the most of it is from google and direct traffic what do you think that could have caused this big jump? stumble upon?
Check your referrer logs to see where the traffic comes from. Maybe you now rank higher on Google for a certain keyword or a higher traffic site has linked to you. However, given the low numbers, it could also have been pure chance. I wouldn't worry (or get excited) too much unless you suddenly start receiving at least a few hundred visits per day.
Yes, you should check your "referer" stats. But IMHO with 58 visitors/day only, your traffic is too low to be called "BIG jump".