You lowballed yourself during your salary negotiation and now your paycheck is smaller than you'd like. In some cases, you can go back and ask for a higher salary without jeopardizing your job, experts say.

Of course, the best time for negotiating salary is before you accept the job offer. Asking for more soon after you're hired is not without risk.

"Going back to renegotiate areas about which you have already agreed does have the risk of making you look like someone who doesn't honor your agreements," says Janet Civitelli, PhD, a workplace psychologist and career coach in Houston. "It can leave a bad taste in the mouth of the hiring manager and launch your relationship with your new boss on a sour note."

Instead of asking for more money, consider negotiating compensation and benefits not addressed in the initial round, such as a signing bonus, more vacation time, tuition reimbursement, professional memberships or a flexible schedule.

"This way, your total compensation package goes up and your reputation remains intact," Civitelli says.

Still want to go for it? Try one of these three negotiation strategies:

Argue Pay Parity

Sometimes you don't realize you should be earning more until you find out what your coworkers are getting. That's what happened to Ashley Baxter, a Texas marketing professional who found a male coworker was getting $10,000 more for doing less.

"I put my resume on the market and received a job offer from another company," she says. "I then went to my employer and let them know that I felt slighted by the way they treated my salary negotiation and did not appreciate being monetarily undervalued in comparison to my coworker who did less work."

She got an immediate 8 percent raise, but her relationship with her boss changed. "He became reluctant to approach me about everyday tasks and avoided emailing or talking to me unless it was absolutely necessary," Baxter says.