1st pregnancy :so confused

I took a pregnancy test two days after my period was due it came back positive seven test later ! Lol...I was having really bad cramps in my belly button so I went to the ER and also They did urine/blood test both came  back positive and my hcg level was 168 they did an U.S . No sac but it showed my lining thicking up. .I did one of those clear blue easy test and it said I was 2 - 3wks my period was very irregular so I can't pinpoint conception do anybody know what all this means?  Is 168 a good number?