NO, if you entered as a tourist you would not have an A#.  You can leave that blank if you do not have it.  If you are the beneficiary of a I-130 petition and you entered as a tourist, if your petitioner is your spouse, you can and should file the I-485 with the I-130 and as soon as that is filed, you will be given an A#.  ALso, your green card process will be much faster that way.