I'm confused

Magen • I'm 28 •I have 2 boys 2&7•
Hey ladies! I've been so tired for the past three days sleeping til like 12 then taking another nap around 2 today I slept til 4:30! Going to bed around 11:00. Feeling super nauseous today as well more than any other day, took a preg test this morning and neg result! Been ttc first time the 18 (on my period) til now. Period comes around nov. 20something (irregular period due to mirena removal 6 mos ago) could I be experiencing early signs of pregnancy?  Thanks ladies ❤️