Honestly, I've never heard of it being a sign. While a lot of women feel twitches when they're pregnant, they feel it in their uterus. Considering this would be a very early pregnancy, the twitching would then be felt in the lower abdomen, and even the pelvic area. Just a side note, while some pills will cause you to not have a period, all pills can cause break through bleeding. Break through bleeding is not a period, just spotting. If you're really worried about it, take a test or see your dr.
