I thought the 7 day pill bleed wasn't nessesary - certainly lots of new particles have suggested it wasn't necessary.
Contraception: The way you take the pill has more to do with the Pope than your health
Shortly before his death in 2015 I attended a lecture given by Carl Djerassi, the "father of the pill". He remarked that the seven-day break, and resultant withdrawal bleed, was designed into the pill in the late 50s in an attempt to persuade the Vatican to accept the new form of contraception, as an extension of the natural menstrual cycle.
www.irishtimes.com/life-and-style/health-family/the-contraceptive-pill-is-the-one-week-break-a-relic-of-the-past-1.4066053
But Jane Dickson, vice-president of the UK Faculty of Sexual and Reproductive Healthcare, is at pains to point out that there were other reasons, historically, why the pill had a seven-day break: “So there were many reasons why there was a break when the pill was introduced,” she said earlier this year. “One of the most important reasons is that the pill that was used 60 years ago, some of the hormones that were in that pill were 100 times greater in dose than the pills we have now.
“Quite often, women actually felt quite dreadful when they took it. Part of the reason for the seven-day break was just a break from the massive amount of hormones.”
In addition, and because contraception was new at the time, there was a lot of anxiety about how it affected women’s bodies and so a simulated period (a withdrawal bleed) was thought (by whom?) to be reassuring. And one of the other reasons for the break was to reassure women that they weren’t pregnant.
Certainly both articles say it's common now not to have the break - which I have to admit I'd have prefered in my younger years though looking back I never really got on well with the pill anyway.