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In simple language, diminished ovarian reserve
suggests that eggs is your ovaries are depleting soon and you have less time to conceive before they are completely over. More over your husband also has asthenospermia, all these situations make natural conception difficult in your case. Hysterosalpingogram is done to know patency of tubes. There are no medication which can increase ovarian reserve ( its genetically decided during intrauterine life). I would suggest you to go for 3 cycles of IUI if tubes are patent ( determined by HSG
). If tubes are blocked or if 3 cycles of IUI fail straight away go for ICSI
& IVF before its too late . IVF and ICSI is best available chance. All the very best.