Early signs please??

Hi can anyone help me a little :-) 
​ 
​I had sex with my partner the 1st August, which was an ovulation day for me
​2 weeks later I came on my period very light and for 3 days 
​I had sex 5 days & 2 days ago
​Today I feel awful!
​I'm so tired I really don't want to move off the sofa or talk to anyone!
​Could this be an early sign or am I just moody and sick of the rain lol
​X