Beta, at one week you cannot really check anything even with home tests. Just eat healthy, avoid heavy lifting, and drink some warm ginger water if you feel slightly uneasy. Wait for your period date first.
There is no simple way to check at just one week, home kits won't work. The cheapest and most workable solution is to buy a standard 50-rupee test kit from the chemist and wait for your missed period date. No need to waste money before that.
You can't really confirm a pregnancy at one week, it is way too early. Just continue with your normal daily walks. Don't start any heavy gym sessions or yoga poses until you miss your period and get your doctor's okay.
Honestly, I am in my second month now and even I was searching this at one week! But actually nothing shows up so early. Did you feel any metallic taste or light cramping yet, or is it just anticipation?
At one week, I felt absolutely nothing and didn't even know! It was only after a few weeks when my periods got delayed that the realization hit me. I felt so emotional when I finally saw that double line later.
My mother-in-law used to say we can tell by body warmth, but medically you can't detect it at one week. It is best to wait for a missed period and then visit the doctor for a proper blood test.
Please don't rely on any early symptoms or weird tricks at just one week. I had some complications early on, so I learned the hard way. It's best to wait, take a proper urine test after a missed period, and consult a doctor immediately.