Ok...

So I went to my ob the other day (Thursday) to get checked out cause I had had some spotting and mild cramping several dad before that. (He's only in my town on Thursday). They did an internal sonogram and said everything looks ok. But, there is no heartbeat. And they estimated the growth to only be about five weeks. I was 6 weeks that day. He told me to relax, no hokie pokie, no lifting over 5 pounds and to come back next week and see if she has grown any and has a heartbeat. I'm trying really hard to not focus on it but it's getting harder everyday. I just don't feel pregnant anymore. No symptoms nothing. Am I crazy? Should I just chill out? This is my fourth child and my 5th pregnancy. (One set of twins and two miscarriages). So it's not like I'm new to this. I'm sorry. I just need some reassurance.