Many women notice that during the week after a period there is hardly any discharge, and what there is has a thick consistency. Towards the middle of the cycle (about 2 weeks after the start of a period) the amount increases and it becomes thin, slippery and clear, like uncooked egg white. When this discharge is exposed to the air it becomes brownish-yellow, so it is normal to find a yellowish stain on your undies at the middle of the monthly cycle. There may also be a feeling of moistness and stickiness.
this is usually when you ovulate and so can become pregnant.