Really confused and stressed out..i am pregnant or not?

Patient: I just recently lost my virginity in December, the day that happened was on the last day of my period and we did not use a condom. I’ve had my period for the month of January but it was really light and kept stopping for about 4 days and it didn’t feel like a regular period. I took a home pregnancy test and it came out negative but i still have all the symptoms: the nausea, the lower back pain, the fatigue and dizziness, and i been eating everything in sight almost even my stomach feels weird and kinda tight so i’m really confused right now..What should i do?