you'll be fine. but don't travel while your OPT application is pending and/or while you are waiting to get hired. get your EAD, get hired, get a letter from your employer stating that you work for them and that your work is directly related to your major, and you're set! i did that a few months ago, no problems at all at the POE, even though I had forgotten to surrender my I-94 when I left the U.S.