Nausea waves....

Rickie
My SO and I BD October 10th, 18th, and 21st. I have had sore breasts (very), very tired!! (In bed after work by 7) very unusual for me.... Then this Tuesday I had a little nausea start, and my im tired but can't seem to sleep ?. Everyday the nausea has gotten worse... Today was Horrible but no vomiting. I have taken two tests on last Saturday (way to early) ad one today (might be to early still) and both were BFN :( anyway what  getting at is has anyone had something similar and my period is due Saturday when should I test again if it does not come???? Please help me it's stressing me out