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You can check who sponsored you by searching in the @steembasicincome transactions history. Upvotes you can see through tools like Steemworld. We eventually will have some more user-friendly tools of our own.
https://steemworld.org/@steembasicincome

Please keep in mind that if they are in pool 2 their upvotes may come from @sbi2 instead.

@steembasicincome (57) one more question, how do I know what effect having more shares will have? I noticed that you're upvote was worth more when I went from one share two three does this ratio continue? Can you explain this little bit for me thank you

Yes. The total potential weight from each pool is 7000% (think 10 full upvotes daily over 7 days) per week. We identify each shares total % in that pool. Imagine pool 2 reaching 1000 shares: each share would receive 7% upvote weight.

That's a weekly figure, and people post at different frequencies, so for each person we calculate their total weekly upvote weight (based on their number of shares) and then divide by their posting frequency. If one share is 7% weekly, then a member with one share that posts daily would receive a 1% upvote on each post, but a member that posts only once a week would receive a 7% upvote. Now, if both members increased their share count, their total upvote weight would also increase (to 2% and 14%, respectively).
The weekly upvote weight per share is constantly changing as more members sign up (one reason to have multiple pools- pool 1 changes more slowly than pool 2), so you might add a share and not see your upvote weight change (but see more value from each upvote anyway). You might also see the value of your upvote drop sometimes if you start posting more frequently, or if there is a downswing in STEEM price - even if you are growing your share count.

@steembasicincome (57) thanks so much for going to such lengths to explain this, that's very helpful 👍☺️ does it help you when I upvote and resteems your posts?

You have 2 bonus shares from your upvoting history, and that will continue to grow if you consistently upvote. It helps the pool when our members upvote the updates, so we reward our members for those upvotes with bonus.