2 babies months apart in womb ?!

A girl I know was pregnant with a baby boy she was around 5 months in January and still hasn’t had the baby she said it ended up being two babies and the one passed and the second baby is only 4 months along so she has to go through the whole pregnancy again ? Is that possible edit : shes not saying she got pregnant again with 2 nd baby after losing the first she’s claims she got pregnant with 2nd baby while the first was still in her stomach ..