Help me I’m terrified I might be pregnant!

Hey, I had unprotected sex on the 1st, 2nd, 3rd and 4th, I must’ve just been unlucky and got a bad batch off condoms because every one split, I’ve just downloaded this tracker to find out that was my most fertile days! Now it’s only the 9th so that’s why I’m unsure because isn’t it to early to feel anything ? I woke up at 4 this morning feeling sick but I don’t need to be sick my body just feels sick, and I went to the toilet about 2 hours ago and there was blood on the tissue, my period isn’t due until the 24th, I’m only 17 and I don’t know what to do!