Singer Britney Spears sparingly took birth control tablets because they made her gain weight, according to reports. The Toxic singer - who reportedly suffered a miscarriage at the beginning of the year (07) - was receiving Depo Provera injections, but switched to tablets after piling on the pounds. But Spears continues to forget to take the contraceptives, leaving her vulnerable to pregnancy. A tells website Life Style Extra, "She's constantly forgetting where she put them. She seems to find it amusing - she laughs at how scattered she is. "She seems to think that just because she isn't a formal relationship, she's somehow immune to getting pregnant."