Bleeding after sex!

kayla
Okay so i have had the nexplanon implant for about a month now (since oct 3rd) and i just had my period last week. Its was late due to just losing my virginity the 18th of september and my last period ended the 9th of september. And i ended it 2 days ago but i had sex last night and started bleeding again? Is it normal to bleed after sex? Is it a pregnancy symptom? I'm 18, and just got bc for the first time too. Everything is new to me. Please help. Thank you.