Me and my So we're not trying to conceive but I'm 10 /11 days dpo and it's way to soon soon to test…

Me and my So we're not trying to conceive but I'm 10 /11 days dpo and it's way to soon soon to test (I think) but I'm feeling extremely odd and I'm having light cramping and my boobs are sore and heavier than usual I just feel all around odd my daughter is only 8 months and I haven't brestfeed in about 6 moths and every thing was nearly back to normal I'm not sure if my minds messing with me or if it's possible to start picking up on these things so early it's a possibility that I'm pregnant but it would have happened directly after my period , I'm at a loss here and wondering what other lady's thoughts are on the topic and if any one has experienced this is it all in my head?