Can you get implantation bleeding after 17 days of sex ?

Call it spotting: If one were to get some vaginal spotting around that time, and her normal regular period did not come, then that timing would be right for implantation spotting. If actual bleeding happened, similar to period bleeding, it probably wasn't implantation spotting. In any case, one must be pregnant in order to say prior spotting was due to implantation.

Yes: You can since you dont know the time of ovulation or implantation. Often times, a period is delayed and women are concerned about being pregnant. With a history of unprotected intercourse, the anxiety due to a possible unplanned pregnancy rises. A easy way to determine if you are pregnant is by doing a home pregnancy test. It can be done around the time of your expected period.