I was at the pharmacy today and noticed there is a home pregnancy testing kit that claims to be 98% accurate and can be done 8 days after conception. The pack contains 2 kits. Make sure you follow the instructions precisely to get a more accurate result.
In other words 8 days after you have had unprotected sex with full penetration or unprotected sex when the man withdrew. Men can still release a pre *** that could make you pregnant.
I absolutely agree with everything jemma116 has told you! However, it may not be too early to test since you said you had a light period. I would do a pregnancy test to be on the safe side of things.
You may have had a threatened miscarriage, but it may be too early to get a correct reading just yet.
As your lower back is "killing" you, you still may get your period or an early miscarriage. Just keep an eye on things. Take pain relief medication as directed on the packet for your back pain. You can have a hot bath to help ease the back pain and you can also apply a heat pack or a hot water bottle wrapped in a towel to help ease the back pain.
You have put a of weight on and that can affect the size of the boobs.
You have got a lot of fluid retention and that can affect the bloating belling and the size of the boobs. Bloating belly can also be due to a lot of wind.
If you have not done any exercise over the last few days, then book an appointment to see your doctor to check the pains in your calves. He may listen to the veins and may order a Doppler test. If this is exercise induced, then it will settle in a few days and you don't need to worry about it.
Let me know how you get on.
Bet wishes.