Pregnancy

So on November 27th, I let a guys take my virginity and ever since I have been feeling weird. But about a week after that I started this weird period that was just like a period but it was a whole week early and my period are never early or late. I’ve been having cramps feeling bloated , very tired and hungry. But I took a pregnancy test early today and it’s said I was not pregnant but I’m still experiencing all these symptoms and I know it’s not too early cuz it’s been a month and two days now. What should I do ?