Conception confusion

So i’ve done about 5 pregnancy tests all being positive and going off the first date of my last period I’m nearly 4 weeks but the Clear Blue digital tests that I did said 1-2 weeks and I can’t seem to figure out how far gone I actually am😂 This is my second pregnancy and I feel like I’m having really strong symptoms already, I feel really lethargic, nauseous and lightheaded! Does anyone else feel like this only being less than 1 month pregnant? Or is there something wrong? I’m panicking so much😩😩