No I'm not pregnant again, thankfully.
But just to let you know AF has arrived with a vengeance today, and I'm still nearly fully breast-feeding twins, that means 8 feeds a day in total. (they do have one bottle at bedtime, though, at about 7pm)
I did have an idea that I had started ovulating again a few weeks back. So I was very careful.
Also, be aware that the twins are only 6.5 months old, and my periods have returned much sooner than dd1 who I breast fed till 9 months old, but I thinks periods started when she was about 7 or 8 months.
I read somewhere that night feeds have a bearing on ovulation, but the babies have slept through from about 9 weeks, so they have not had night feeds for ages.