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Good explanation, but the hormone that causes nausea is estrogen.
Anyone having OV breast tenderness?!
It's the progesterone....the follicle that the mature egg busts from collapses and releases progesterone to signal the uterus to grow lining to support the egg if it's fertilised!
Now if it is fertilised and imbeds, the body will produce more progesterone, and more lining for upto 9 weeks to nourish the embryo until the placenta can take over at around 8-9 weeks.
That's why we feel it most at the beginning of pregnancy....because it's stronger and stronger to keep up its job!!
Progesterone is accountable for sore boobs/nipples bloating tiredness and headaches, so in the initial release of the egg....3-6 days journey to the uterus and upto 9 days before implantation the levels are pretty much consistent, meaning you will notice it initially and get used to it....only to notice it significantly again if a fertile egg embeds and the levels rise again considerably.
Not only progesterone, if the fertile egg embeds your body will begin to produce HCG also.....in small amounts first, then doubling every 48-72 hours giving you initial peaks and troughs of mild pregnancy symptoms a few days at best a week before predicted AF.
HCG is responsible for sickness, nausea, mood swings, frequent peeing, and tiredness.....for a while the two hormones cross over causing some women pure havvock, others and left completely unawares.
Depending on how in tune you are with your body you can really predict these changes, and without viable pregnancy you should only feel the affects of progesterone mildly for a week or so, then when AF is due, and no egg is implanted the body produces oestrogen to signal the cycle to start again, you bleed, you ovulate and so fourth.
Oestrogen causes breast tenderness too to work backward from the preparations the progesterone made, but you will feel this differently a day before or on the day of AF, along with distinctive cramping and lower back pain, almost indefinitely followed by blood loss.
I find it easier to write down my different symptoms every month xx good luck xx
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