Was 15 days late for my renewal depo shot with spotting and recently got it friday. had unprotected sex same day but no cum at all. should i worry?

Probably ok, but...: Can test if worried. A urine pregnancy test gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. If a woman gets her normal regular period, then she is not pregnant.