Hi Callie,
If your period was due to start on or around May 24-28th then you are within the time period where a positive pregnancy result should show up. Most girls will use a home test first. If you choose to use one, use your first morning’s urine as the hormone level will be at its highest. If it reads negative, you could take another one to be sure you did the test correctly. But, I would go to your clinic to get a blood test done. They are the most accurate and there will be no doubt in your mind when you leave. If your concerned about privacy and cost of getting a blood test done, you can call this number. 1800-395-HELP They will put you in touch with a clinic in your area where you may get FREE and CONFIDENTIAL testing.
I hope everything goes well for you and your boyfriend and that if you are pregnant you and he will find the love and support you need.
God bless,
myangelsinheaven