Hi, Welcome to HCM, I am Dr. Das
As you have a pregnancy
previously it is proved that you are not primarily infertile. you are facing secondary infertility
From you history putting on extra weight indicates to a polycystic ovarian disease
which must be confirmed by USG whole abdomen alongwith a total hormonal
profile including FSH, LH, TSH. These will clear what you actually have . Then it can be said whether you can able to concieve or not.