Hi, and thanks for your medical question on eHealth forum!
If this is the first time that you have been cramping after your periods then yes, please take a pregnancy test. Blood HCG estimation may be more reliable and there may be possibility of ectopics. However, cramping at the end of the periods can be due to pelvic inflammatory disease, ovarian cysts, or STDs or due to endometriosis. It could also be due to cervicitis, bladder infection or plain simple UTI due to improper hygiene during periods.
Discuss these possibilities with your doctor (preferably gynecologist). A comprehensive investigation is required keeping all the points in mind. Hope this helps. Take care!
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