asking for opinion

I had a miscarriage 3 months ago.now I'm pregnant again I went to my ob and she did transv wala pa sya nakita Kundi endometrial thickness and she considers early pregnancy .4 weeks and 3 days from lmp ko. Sabi nya repeat nya scan ko in 11 weeks na daw ko during my next check up na. I'm worried kase walang repeat scan after 2 or 3 weeks.iniisip ko ok lang ba mag change ako ng ob? Folic lang ang bigay nya sakin. By the way 37 years old nadin ako kaya medyo worried Ko.thanks sa response po.