Aw, first time pregnancy anxiety is so real, mama! Maraming moms namin dito had low-lying placenta sa early weeks at it moved up on its own by third trimester, kaya yung doc mo is right na maraming cases like yan talaga, just keep an eye sa bleeding at follow-up ultrasounds mo closely, and honestly, it's worth asking your OB kung ano exactly ang mga warning signs para sa iyo so you're not guessing every time may spotting. Dami online horror stories na nakakaworry pero majority talaga ng cases resolve naturally, just take it easy din, no heavy lifting or strenuous activity. How are you feeling otherwise, mama?