They are designed to test from conception. So you would be 1-2 weeks pregnant when you are technically 3-4 weeks. So if you are actually 5+4, then subtract 2 weeks, and it should still be around the 2-3 week range, possibly 3+ weeks if your urine is really undiluted. But yes, at 5 weeks, you would expect to get something around that, so it's showing exactly what it ought to. But you know you're pregnant, so no need to mess around with them anymore. Just ejoy your pregnancy.