Good morning. I have been taking birth control pills for some time. Previously (for 10 months) Rigevidon, now (the last tablet of 2 packs about 4 days before withdrawal bleeding) Belara. Always before bleeding from withdrawal even when taking pills but it is the latter (just a few days before bleeding) I observe various ambiguous symptoms; headache, lower abdominal pain, nausea (but not vomiting), weakness or drowsiness, sometimes pressure on the bladder, irritability and general reluctance. Every time I get stressed that I got pregnant. I know that the tablets do not give cito 100% protection but they give over 99% and you have to be extremely unlucky not to work. I did not miss any tablet, there were no factors weakening the effect of the tablets or possible interactions with other drugs or herbs, the partner never ends in me. Bleeding always comes on time with varying degrees of severity and sometimes deviations of several hours, but I always have a fear of pregnancy because of these symptoms and freaks out :( Someone tell me where such symptoms come from? :/