I have a 9 month old baby girl and have been nursing her since birth. About three weeks ago, I started to have pregnancy symptoms: higher temperature, nausea, fatigue, back pain, bloating, moodiness,etc. and so on. I have taken two urine tests in the three weeks and they have been negative. I also took a blood test and this is negative. My milk supply has reduced slighly and I have had slight discomfort in intercourse. My symptoms have decreased but some days I will feel all the above symptoms very strongly. I also have bloating and my stomach is not it's usual shape. Could it be that I am pregnant and it is undetected because I am nursing or could it be another issue?

Please help