Please help

Ok... so i have gotten 2 faint positives on first response. Then i tried clearblue and i dont see anything at all... please tell me clearblue takes more hcg because i really wanted to be pregnant.... this would.be my 3rd my hcg levels with my other kids were slow to rise but at 8 weeks was a very solid line... i.would only be 4 weeks based off lmp...i think im freaking myself out idk....