Natalia
My heart goes out to you, is is never easy to lose something that was so loved and wanted dispite only having it a few weeks and never knowing if it was true untill it was too late.
I came across from your other thread, and now have more of your story. I'm concerned for you. I'm am emergency nurse and have seen many things and have learnt alot in my 7 years there. I can't help but be concerned and want to offer my proffessional advice.

You sould follow up on the GP appointment and request to get your cycles checked out, and make sure you are of good health, you could also ask for pre-conception blood tests, to check your immunisation status and blood levels. I would assume she would take blood to confirm PG ( so they should be able to check for blood chemistry, check for anaemia etc...)and perform an internal exam. They might not be able to check hormone levels at this point as they might be all over the place if PG and M/C had occured. Then 3 months before TTC you should start taking pregnancy vitamin tablets. If you require and immunisation booster you might also have to wait 3 months before TTC.

You need to be of healthy body and mind before embarking on motherhood.

When I was 25 and had been in 2x(3 year relationships) both of which I hoped was the one at the time, I had strong desires to have children have children with both these men (luckliy I did not) as I have finally found my knight and we are now TTC #1. My point is rather than missing out on what you don't have, look forward to something you might have in the future. You are still young.

You are 25, and have your whole life ahead of you, the average age of marriage for females is 28 and many ppl are still waiting for that committed relationship before making a move into parenthood. Accidents happen sometimes and many women decide to go it alone, which is a very couragious choice and more power to them.

You need to work on your own happiness, goals, and find some fulfilment in your life at present, find support groups (like this one), friends, family, professionals if required.
Your desire to have children might be so strong because you feel there is something missing from your life. I have a friend who lost her Mum at age 12, her Dad found a new girlfriend shortly after and was never home, along with other problems. She ended up being a wild child in her teens, was then diagnosed with depression after a couple of suicide attempts. She didn't have much family support always expressed her desire to have children, saying she would go it alone. She had a couple of M/C in her teens. Luckily she found her support, gained control of her life and embarked on her chosen path, with the love and support of her husband. 10 years later they are still together and have 3 beautiful children.

Sorry this has been more like a lecture. I hope you find the answers to you delimas. I hope I can offer you some support.

Take Care