Hi Hindoly
FYI :-
3-4 weeks, 0-130 (U/L), Week prior to first missed period
4-5 weeks, 75-2,600 (U/L), Week after first missed period
5-6 weeks, 850 - 20,800 (U/L)
6-7 weeks, 4,000 - 200,000 (U/L)
7-12 weeks, 11,500 - 289,000 (U/L)
12-16 weeks, 18,300 - 137,000 (U/L)
16-29 weeks, 1,400 - 53,000 (U/L), Second Trimester
29 - 41 weeks, 940 - 60,000 (U/L), Third Trimester

It doubles every two days approx.
Hope this help, Tess.