I have been taking Trigestrel for the 4th month now, due to a hormonal imbalance. Last week I was at the beginning of the yellow tablets, i missed them on wednesday, thursday and friday, on friday i had unprotected sex. I only realised on saturday night that i had missed so many tablets. I have been feeling very tired, dizzy andbloated, and have also been getting severe headaches, i don't normally get headaches at all!! Could i be pregnant so quickly?