I might be just paranoid

So had sex (we used a condom) on the 20th and that was three days before my fertile window ends. I know the pregnancy symptoms don’t start until a week or two later but I’ve been just paranoid for the last couple of days cuz I’m not on birth control. So I would get periodic cramps that just feel like my uterus is tightening up and then releasing and I’ve never had that before. I also have been getting tired during the day but that might be me not getting enough sleep. My body just like feels different but there’s no spotting, no morning sickness, no bloating or anything I’m pretty sure I’m okay but I just like need to hear it from someone else.