Any thoughts ladies?

So this month I decided to follow my body. 
Glow has been telling me that my fertile week is this week, however other ovulation calculators have been putting it back a bit so the other night (28th) I had loads of EWCM so we BD'd and since then I've been feeling super nauseous/butterflies in my tummy, a pulling feeling in my lower abdomen and my nipples have been sore. AF is due on the 10th April. 
Just wondering if any of you have any thoughts on this? If you've been or are going through the same thing?