Confused...

My period is 13 days late... I was suppose to start around June 3rd! Had sex the 8th... and it’s the 18th now... I’ve been Having pregnancy symptoms... cramping... headaches... dehydration(My last pregnancy I was super dehydrated in the first 9 weeks)... my boobs are not sore tho! I’m so confused! I’m never late... people say 10 days is to early to test but all came back negative.. I need to know if I am! It’s driving me crazy!!!