Should we go for fertility treatment for second kid?

We are having one kid of 4 years old. We have one miscarriage last year. Both the times conceptions were happened naturally. After that miscarriage, we are failed to conceive even after 1 year of try. In this 1 year, we undergone fertility treatment for 4 months. We did not get success, rather got health issues and side effect. So, we stopped the treatment and now the health is back to normal. But same unable to conceive for second kid. Now, again if we go to hospital, mostly doctor will ask for minimally invasive or invasive procedures. Because the normal treatments & test are already completed. So, should we compromise the health to restart these fertility treatments and diagnosis procedures again? Or we should wait & let it happen naturally whenever it supposed to happen and rest leave it to God? I am in the stage of confusion. I am unable to decide whether to go to hospital or not. I know here most mature & intelligent people are present. So, please share your useful advice on this. What would be your take on this? Thanks.