 [ Symptoms ] can a celiac toddler swim in a large pond treated with barley straw for algae control  our two year old grandson will be visiting our home soon and we hope to let him swim in our swimmingfish pond that has been treated with a few small bales of barley straw to control the algae [ Disease ] in addition to what the other contributor said it is possible that you are pregnant and the hormone is not yet strong enough to show up on the test i went through the same thing when i was pregnant with my second child the hcg hormone was not strong enough to show up until i was already 4 or 5 weeks late another thing to consider is is you have always been irregular then pcos is a possibility too if i were you i would consult with an obgyn soon at least that way you can get some real answers and maybe some stress relief