Talk to Gynecologist on Pregnancy

I had a miscarriage in June this year. Is k baad mjhy July and August me timely periods hue but Sept me mjhy periods nhi hue. Strip test negative a rha hai abhi tk. 3 din pehle me apni gynecologist k pas gai jis ne ultrasound kr k btaya k uterus me ek jaga irregular thickness feel ho rhi hai aur lg rha hai jese early gestational sac hai. Duphaston and myfol tablets di hain doctor ne jo me regularly le rhi hun. But me ne aj suba b strip test kiya to wo negative hi a rha hai. Me bht preshan hun k agar pregnancy hai to negative test kyun a rha hai bar bar. Aur agar pregnancy nhi hai to sac kyun nazar a rha hai ultrasound me and me jo medicine le rhi hun us se koi negative effects to nhi hon gy health pe negative pregnancy ki surat me? Please guide I'm so much worried