Some help about cervix length 19 weeks

Ella

Si this is my first pregnancy. Miracle baby as I only had 1% of getting pregnant naturally. Had my anatomy scan at 19 weeks 1 day and everything looked good. My cervix was measured transabdominally. It measured 3.47cm and now I’m reading that abdominally it usually measures more and the best way is doing a Transvaginal.

Should I request one? Or should I stay calm?

Thank you. Is very important for me to know. I don’t have anybody to ask