Early pregnancy symptoms?!?

So I'm kinda freaked out. I'm 17, and I fooled around with my long distance boyfriend a few weeks ago. We didn't actually get around to having sex (we tried- with a condom) and there was no actual cum involved. I'm scared that somehow precum got inside me from either his penis or my/his fingers. My period is due in two days so I guess I'll know then, but I'm starting to freak out. I've been having extremely vivid nightmares lately (I never remember my dreams normally) and I've heard that that can be an early sign of pregnancy. I've also been super tired, constipated, and have been having mood swings. I'm so terrified, help me please 😰😰