My lmp is oct 27. have an ultrasound yesterday but no gestational sac seen. endometrium is thickened. what does it mean? could i be pregnant or not?

Pregnancy Test Pos?: If the pregnancy test was positive then you are, or were, pregnant. If nothing visible on sono at 6 weeks 1 day since LMP then you might be less far along than you thought from your dates, early pregnancy may have failed, or there could be an ectopic pregnancy. If pregnancy test remains positive, repeat sono in 1 week to confirm uterine pregnancy. If pregnancy test is negative, you're not pregnant.