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Pregnancy chances can be possible even after having tubal ligation due to incidences of tubal spontaneous recanalization (depending on the type of ligation that was done). If you are having functional ovaries and if you are planning for pregnancy, consider visiting your doctor/gynecologist for getting further evaluation done along with a HSG (hysterosalpingogram) test to check for the patency of the fallopian tubes. If the test shows patency of tubes, (along with normal functioning of ovaries), you can go ahead with your pregnancy plans. If tubes are blocked, and non-patent (as shown by the HSG test result), then you will have to undergo surgery for tubal reversal/removal of clips/removal of ligation to make them patent and then try for pregnancy. If you do not intend to go ahead with surgery, or if the surgery cannot be done, you can opt for options like IVF.
Take care.