2 years now 😔

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Been ttc my 3rd for just over 2 years now, I have fallen pregnant twice since we have been trying but both ended in miscarriage. Both of these pregnancies happened pretty quick but now it’s been over 2 years and nothing! So can someone become infertile after already having kids?? Or has these miscarriages done someone 🤷🏻‍♀️ in total now Iv had 3, but 2 close together 🤔 starting to get really frustrated with it all now. Also we’ve recently started taking folic acid supplements for a couple months now. Has anyone had anything like this & changed anything in diet etc and become pregnant ? We both also quit smoking about 6 months ago and arnt big drinkers so I know we are some what healthy 🤦🏻‍♀️ any tips on what else to try before seeing doctors about it all? 😔