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Welcome and thank you for your question.
At 5 weeks, it is quite possible not to see the embryo or the york sac - it depends on the angle of the probe.
A thickened endometrium with rising HSG levles are signs of a pregnancy.
The next scan will probably show the yolk sac and possibly the embryo as well.
The cause for concern here is an ectopic pregnancy - that will also show in the scan if you do have it.
An ectopic will cause pain in the abdomen and occasional spotting. The increase in HCG level is also low. If you do not have these, then chances are that you have a normal, healthy pregnancy in the uterus.
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Since ectopic pregnancy has been ruled out, you have no cause for concern.
The embryo and yolk sac would probably show up in the next scan.