Go get a home pregnancy test. It doesn't need to be a certain brand or anything. And just fyi if its the kind where either a plus or 2 lines means your pregnant, it doesn't matter if the second line is lighter. If there are 2 lines or a positive sign you're prego@
All you can do is get a pregnancy test from a store and take it in the morning with your first mornings urine. Thats when the pregnancy hormone is most concentrated. If you get a negative, wait a week and if you still don't have your period test again. If it's still negative you might want to call your ob/gyn and make an appointment as a blood test is the most sensitive. Good luck! Don't be afraid to ask us anything :-)