Go to drs they might get you to do a pee test at the surgery don't be alarmed if it negative there because there no where near as sensitive
Either way my dr gives me a blood test form for hcg and a bunch if other things like iron and stuff and a form for a dating scan at 8 weeks and then I ring for results at the end of day or next day depending on when it's done and ask for a specific number not just pos or neg some places you might need another appointment to get your results

Tell them your health history too this will tell them if they need to test for anything else that might help with the pregnancy