1 and a half years trying to conceive is such a short period. Going through infertility you should be expecting such reactions. Like what your mother in law is trying to mean. Do not be harsh on her. Neither do not regret on your side. No one wished to be what they are. We just find ourselves in some situations that we cannot help. So it could be better if you and see a doctor. Know what the problem is. It might turn out that your husband is the one with the issue. Just because no one is going through infertility in his family then he is fine. Infertility is mostly not genetically passed. It mainly depends with the lifestyle and what one eats. So try to live a healthy lifestyle and seek medication. I believe that you will find a solution. But for the time being let no hate from outside affect you. Keep pursuing your happiness and looking fir what is best for you.