Is it possible

I know this is going to sound complicated and judgemental on my part but I'm curious. My sil got married a month after she turns 18 literally. So it seemed rushed but she was sure of her decision fast forward A month after being married she's just found out she's pregnant. Surprised not so much seemed odd but apparently before she got married her mom took her to get tested since her getting married was really rushed and she claims that the doctor missed it ? Odd right? What are the odds of that. So everyone is just letting all this news sink when she claims she took a wrong step and fell on her bottom and felt blood come out right away (according to her she was 12 weeks pregnant) so it was confirmed baby died she had a d&c and she said the day after her milk had come in and soaked up her shirt. Now I learned my sil is a liar but with all that doesn't it sound so off ?? I think it wrong due to a baby's life was involved. I have had a miscarriage of course not in the same way or form but her story sounds fishy.