Could I be pregnant? No period symptoms yet

The last time I had my period was march 9th. Sometimes my periods last 4-6 days. This one lasted 4. Normally it'll take 25 days for my period to start again. I had unprotected sex march 19th but he did NOT cum inside me. I also had sex April 1st with a condom and he finished then a couple minutes later we had sex again without a condom. Again he didnt cum inside me. It is now april 11th and im having no period symptoms. Normally 4 days before my period comes I get cramps and I can tell it's coming. This time it's not like that at all. My breasts don't really feel tender and I DON'T feel lightheaded or dizzy or anything (pregnancy symptoms??) I have been stressed this whole week and I know that can delay your period but I'm really scared. I do not want a kid right now I'm only 16. My sister is 21 and she has months were she won't have a period at all but she's not pregnant of course. She said this starte happening when she turned 16. So am I pregnant or just late? I really need help. Thank you