So im 15, i know😔, but me and my boyfriend had unprotected sex about a week ago, mabye a bit longer. But w

He has always pulled out on time when we do it unprotected. But this morning i got a gext from him saying the last time we did ir unprotected he dosent know if he came in me or not. And now im like really worried. When we had sex unprotect it was at the end of my period and my nex ine isnt due for about 2 weeks. And i googled symptoms and i only have one wich is headaches. Im really worried, and dont know how higjt the chances of me being pregnant are...plz help!