UC and child support

hey! so I have a 1 year old and pregnant with my second, I am currently unable to work so I am on UC my BD sends me aprox £100- £150 depending a week towards my child and the pregnancy to help out will this effect anything with UC as it’s an agreement we have, I moved into a private property so rent is double what it was so he offered to pay an extra aprox £30 a week towards that as I have our toddler full time just curious as seeing a lot of UC checks going around :)