Blood after doing the deed

I’m a virgin so last night I used a like normal sized(like a real penis) dildo for the first time ever. And it was fine but when I was finished I started getting cramps really bad and I haven’t gotten my period in like a year since I have the implant… but then I started bleeding. And this morning I bled on my underwear. Why am I bleeding??? Did I pop my cherry???? Did I just start my period after like a year????? If I popped my cherry, what does this mean???? WHAT DO I DO???? Please help 😅😅😅