Advice please

So ladies could any of you help me this month is a weird one so I was due to ovulate 26th but I think I ovulated 25th I've had cramps on and of since just before ovulation yesterday I woke up feeling terrible I was all full of cold felt really hot and I was being sick all morning 4-5dpo I've woke up the same this morning 5-6dpo yesterday my sil asked if I was pregnant I can't eat my backs killing me and as silly as it sounds my dog smells weird my question is could you have symptoms like this that early? I've just come off antibiotics for tonsillitis so I don't know if my immune system is low or if this could be my month? Thoughts?