<s>[INST] I am 31 and have been on t/t for infertility for 2 yrs...no apparent cause has been found on endometrial biopsy, hsg, even laparoscopy...finally my mens got delayed my lmp is 18/10/11 ... my upt was weakly positive.. n beta ChatDoctor was 137mIU then 149 48 hrs later... now i have spotting....n have been advised to take crocin...please advise.. [/INST] Thanks for posting Q on ChatDoctorA good quality urine prey test is fairly accurate to predict pregnancy. Quantitative B Chat Doctor assays will give rough idea re no of weeks into pregnancy & in a normal viable pregnancy levels should normally double every 2-3 days (85% of cases) this also means in up to 15% of normal pregnancies the doubling of levels is slower than normal. This applies normally to prey up to 6-7 weeks after which rise in BChatDoctor levels slows down & serial Ultrasound examination is a better predictor. </s>