Hi @Hllouise1702 - sorry to hear your first round was unsuccessful. I know it won't make things any easier, but a first cycle (you used the word 'round' so I'm not sure if you're talking about a single transfer here or a full cycle) is often considered 'diagnostic' and the vast majority of people will not see success from one cycle alone.
I'm not sure what exactly happened in your situation, but your clinic should have learned a lot from how you responded to the protocol, what happened to your embryos, if you got a transfer etc. All of these elements can be taken into account and depending on what happened, can be tweaked if you decide to go into another cycle.
Similarly, if you have any embryos left and you've had a failed transfer, there are lots of investigations that can be undertaken on either your embryos (i.e. PGT) or uterus (i.e. ERA/EMMA/ALICE) to see if there might be any underlying reasons why you were not successful.
Either way, you should be having a consultation with your clinic who will go through what has happened and outline their thoughts for what you should do next. I would advise doing some research in advance and taking a list of questions that you would like to know the answers to.
I will say that I didn't really too down after my first cycle was unsuccessful as I had expected it due to the stats, although I was disappointed. I totally understand anyone that does feel upset or sad afterwards though. What helped me was making a plan for my next one and trying to get help/advice as to what could be changed to hopefully make it better. Wishing you all the best.