Hi, I have not started my periods.. Can I be prenant? I had sex on the 15th february, and then had my periods on the 2nd march.. But I wasn't on as heavy, I was meant to start again on the 2nd but I haven't, what could be the problem? I have also been VERY moody, and been worried+curious and have other things on my mind. I've also been getting leg pains, and been very tired, but then again that could be because I've been out+about a lot, please help!!