Well the principal problem might be a disorder in ovulation due to obesity as a result of which also you are getting irregular periods
Please do a thyroid profile and a fasting plasma insulin
and please loose weight .
Well susten or duphaston
supportive hormones that might be taken in the second half of menses if you expect timely ovulation only ( in case of normal monthly cycles). If your cycles are delayed, ALONE it might not help on a pregnancy a though you may get normal cycles due to withdrawal effect of progesterone
.The rest two are OK.