But I don't know how far along

My periods have been irregular. We have been trying since January 2016 pregnant Feb. But m/c then again late March and again m/c. Nothing till I got this 10.26.16. Blood test te next day was 46.5 hcg and 7.5 progesterone since then levels are rising next blood test is 11.9.16 then ultrasound. They have me on 200mg progesterone once daily. So nervous and anxious to find out due date.