hello and thank you for asking HCM,
I understand your concern. If you were sexually active, especially in your fertile days, there is a chance. Your fertile days are usually around 10 to 16 days before the start of your next period. If your menstrual cycle is 30 days long, this would be around days 14 to 20 of your menstrual cycle. My suggestion is to make a pregnancy
test and visit your gynecologist either the test is negative or positive. If it is positive you have to visit him to start proper prenatal care
, if it is negative, sometimes, especially in the early stages of pregnancy the test can be false negative. But regarding your symptoms it could be pregnancy.
I hope this answer was helpful to you.