Went to hospital yesterday for pains

Turns out I’m pregnant.

All pregnant test came out positive with solid lines.

Did ultrasound and transvaginal & doctor cannot see anything.

Had my lmp 27th if October.

According to lmp I am 4 weeks damn near 5.

But according to BLOOD tests I am 1-2 weeks NO MORE than 3.

I’m very scared and worried because doctor said this could mean that I am losing or have already lost the baby VERY VERY early. Must come back for checkup in 2 days. Has anyone ever gone through this ???