Mine started right away, before I even found out I was pregnant. I actually was so tired that I went to the doctor to have my thyroid checked. When the test came back normal I just didn't understand, I knew SOMETHING was wrong with me. Well soon after I got my BFP!! So yes, the tiredness can be IMMEDIATE for some of us.
I found myself falling asleep in the evenings before I even took a test. Seemed normal for us since I can sometimes be sleepy after work. I was quite tired wk 4-5, but wks 6-7 haven't been very fun. I've been sleeping in very late (like afternoon!) because I've been waking up repeatedly during the night and just staring at the ceiling. Not fun.
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