4 weeks 5 days no sac!

beauty

Hey guys so friday i went to my dr. Appt found out am pregnant. Did a sono at 4weeks 2days and no sac. Hcg was 60! Went in today to retest will find out if it went up by tmmrw. But did another sono today still no SAC!! Dr. Said its to early to see anything. Am freaking out! Has this happen to anyone and still had an successful pregnancy? Just retested and test is stronger than ever