I have a B2 visa. I married a citizen and pregnant from him. We sent the I130 and I-485 documents very close to my ending day of visa and I still didn't receive an answer. Do I need to buy tickets in case I'm rejected?
You should stay in the US and finish the process. If you leave before you get travel permission, your case will be denied. In addition, the I-485 filing allows you to stay beyond your B visa I-94.
You can certainly stay while the case is pending. Assuming that the I-130/I-485 were filed before you fell out of status (it seems from you query that this is the case) then you have not accrued unlawful presence. If the case is denied, you should immediately seek the legal advice of a competent immigration law professional to try to get the case reopened. Alternatively, you may be able to re-file the case.
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