Dear Seacrown and Hopefully. I am so sorry for your losses. I know it hurts so terribly. Virtual hugs to you both.
I lost our daughter at 19+ 4 a few months ago. I know the temptation to focus on when the next period might come. It was my main focus to start with. My cycles have now returned but it took more than 5 weeks. Mine is not an entirely standard history as a few weeks after delivery they found I had a retained placenta, then I had some haemorrhages, one an enormous one, then they discovered yet more placenta remaining - so I have just had another round of surgery a month ago.
What I learned in this horrible time has been to trust my body. My body told me to get back to the hospital after I delivered and to stick around like bad smell until they found out what was up. It also told me to get back in after the haemorrhages. Thankfully I did as it has turned out that I was right that things had not resolved both times. My body also somehow told me that the initial lack of periods wasn't a problem.
My advice would be to bear with your body as it physically recovers from birth. Certainly tell your gp at the 6 week check up and maybe also the bereavement midwife if there is one at your hospital and keep an eye on it. If it is worrying you before 6 months or behaves strangely go back to them and if it is feeling very odd, or as if everything might not all have left, ask them to arrange to scan you or rock up back at Epagu and pester them. If suggest bringing a photocopy of your post birth discharge summary with you to avoid the 1. Are you pregnant? 2. Have you had any children 3. Could you be pregnant questions. Saves a lot of upset and helped get me seen. On me, the trans vaginal scan showed both what was remaining (the problem) but also that my ovaries were just about to ovulate and the endometrium was growing (Good news). When going through such a rough time any good news can be cheering.
Our advice from the hospital was to wait 6 months to a year before ttc, which at the time the advice was given sounded like way too long to bear, and we initially thought we 'd ttc far sooner. 3 months later, it sounds about right. But everyone is individual.
Meanwhile be kind to yourselves. It totally sucks and you will remember your babies every day, and there will be days when you were far more upset than the day/ week before, but the vast pain and horror does ultimately lessen. Starting periods is just part of that. Good luck