according to this app, and yes I've filled out the average cycle length and all that completely and accurately. I didn't have my period last month and I should've had it near the middle or close to the end. I've been experiencing symptoms like, tender nipples, sore boobs, nausea , constipation , mood swings, that jazz. All the pregnancy tests I've taken said negative but that just seems really odd to me. Please comment thoughts or personal experiences. All input is helpful, thanks!