What are you most worried about?
Maybe we can help with that, i don't think it would be possible to say one way or another if it was a definite loss or a weird period. Did you have any pregnancy symptoms before the episode of bleeding? Perhaps ones you previously ignored but with hindsight can see? In my experience my pregnancy hormones were often very low BEFORE i even began the bleeding of a loss, so i do think it's very unlikely at this stage that a blood test would help, though if you want to have one anyway and can do so then why not? If it helps it helps.
I have had 4 losses and your experience sounds familiar to me. THat is obviously NOT definitive. It does sound as if your body has completed whichever process it was (loss or menstruation) itself, safely. This is good news. A longer cycle while your hormones settle down is normal, and so is an increase in breastfeeding from a toddler a normal response to the changes in milk flow which occur during the pregnancy. So you could just be waiting to ovulate having been disrupted by both the loss and the increase in prolactin (if your LO has been nursing more lately). Or this cycle-weirdness could just be the randomness of the return to menstruation (my first few cycles were 56 days long and HEAVY after DD2) after breastfeeding.
Try not to worry. Strength to you.