Aw mama, I can feel the worry in your post, three years of trying is emotionally exhausting, so your stress is totally valid! A thickened endometrium can actually be a good sign in early pregnancy (it's the lining that nourishes the baby), but honestly, at 5 weeks with a positive PT, you really need to follow up with your OB para ma-confirm ang findings and make sure everything is progressing okay, sometimes the ultrasound angle or timing can affect what they see, so don't panic yet. A few of us TTC moms I know had similar scares during their first ultrasounds, pero nag-normalize lahat after follow-up appointments, kaya keep your chin up and get that appointment soon. Sending you baby dust and prayers, hopefully next update mo ay good news na!