Haven't had sex with my DH in 3 weeks? O__o

Ladies... I'm just into my feelings. Last time me and my DH had sex was good but we haven't ever since and that was 3 weeks ago.... But we haven't been on the best terms and have really been fighting. It does break my heart number one because I feel like maybe he is not attracted to me... I don't want to sound insecure but you know us women sometimes over think things lol we also work weird schedules so that might to it and can I mention his father lives with us and literally sleeps next door from us!!! What a bummer :/