heya i started to get cramping when i thought i was 7 weeks pregant, and they did a scan and couldnt find anything, they did the hcg test and the level increased, fromthe hcg levels i was only 4.5 weeeks pregnat which i why they couldnt see anything, and they didnt pick anything up until6.5 weeks.
so it may just be that ur too early in ur pregnancy to detect the fetus.
hope that helps
takecare
xxx