Weeks ni baby based sa LMP vs TVS contradict. Has anyone have same case?

Has anyone experience this? 2 x transvaginal ultrasound pero ang result almost the same. 1st transvaginal is based sa LMP ko dapat 6 weeks na ako but the result is only 5 weeks, ung OB sonomogist ni required to repeat TVS after 2 weeks 2nd TVS (after 2 weeks) based sa LMP ko dapat nasa 8 weeks na si baby but the result is still 5 weeks p lang sya. As per my OB ok naman ung result at no bleeding nmin based sa finding ng OB sonologist. Has anyone experience this kind of result? Repeat TVS ulit ako on Feb 14 (3rd time)