Worried

I found out I was pregoo a couple days ago.. at 6 days before I usually get AF. Now I’m 3 days away and I’m still getting faint lines. I went to the dr, she confirmed through urine but also showed faint. So we ended up doing blood and to go in on Monday and draw blood again to see if the hcg levels are doubling like normal or not. The reason I am so worried cause I’m cramping for the past few days. And this is so common before I get my period, cramps. SO the faint lines are also worrying me. Can someone just put my mind to rest for. Little bit and anyone else cramped early on? And also had faint tests and successfully had a pregnancy/ baby.?