Am I pregnant?

Okay, I lost my virginity a month ago. let me pre-reference some things. I had the starting symptoms of an eating disorder. Everytime I would try and eat I would get sick and couldn't mentally keep food down. When I lost my virginity we didn't use a condom but I wasn't worried because I felt him cum on my back. well, a week afterwards I started craving food like crazy and i could eat all of a sudden. I had my period so I wasn't worried but my period was way shorter than normal. I start getting cramps after my period was already over and I was super emotional. I've taken two pregnancy tests and they both came back negative but I heard it could still be too early. I keep getting random cramps and cravings and crazy mood swings. I'm tired all the time and I need to know if it's still possible to be pregnant with all of this and if I should go to my doctor and find out.