Low HCG level. Again after a few days?

Hi I am 30year old n my husband is 31. It has been 17months for our marriage n trying for a baby since 8 months. As per report I'm having low amh 1.42 so we have done IUI last cycle. I got 5 good follicles n husband's count n mobility was good even dr said that everything is fine n IUI too went well so high chances to conceive. I do not have any Oder issues as all tests came good including all blood tests, HSG,etc. Done IUI on 31st n 1st in a row as  I got good follicles n dr asked for it.   Ihave checked my HCG level after 12 days of IUI wch was yesterday it was 1.20 wch is negative...is there any chance? Can it be increased later if conceived? Need to do HCG again after a few days? M not getting any symptoms. Pls advise