I've been a single parent for a couple of years since I left my ex husband and am meticulous about providing correct info to HMRC, so not sure why this is worrying me so much. Basically after a brief "relationship" (different man) I am pregnant. We are not a couple, he has never lived with me, shared finances etc, so I continued with my sole tax credit claim. However, I will need to ring when the baby arrives in a couple of months to advise of a change in circumstances, I.e claiming for a 2nd child. Will they believe I am a single parent or will they assume I've been claiming fraudulently and investigate me?