Am I pregnant?
Some women just seem to have an inkling that they're pregnant even before doing a test.
"Doctors will tell you it's medically impossible, but lots of women say they just knew they'd conceived, even after they'd just had sex," says Siobhan Freegard from the parenting site Netmums.
So if something feels a bit different it may be an early sign of your body changing. So what to look out for?
A classic sign is sore breasts. They may feel uncomfortable, tender and tingly. A bit like before your period as your hormone levels change.
"Your breasts may feel heavier, swollen or fuller," says fertility and pregnancy expert Emma Cannon, "and the nipple area may darken."
Once your hormone levels stabilise your breasts won't feel so sore.
Some women feel totally wiped out when they are first pregnant. It's as if that tiny embryo has sapped all of your energy.
Fatigue can be related to a high level of the hormone progesterone, but it could be down to low blood sugar levels or lower blood pressure.
Mum-to-be Carly says: "I just remember feeling very tired and almost flu like in the very early days before any sickness even started."
Many women get a boost of energy in the second trimester before it's back to fatigue on the home straight!
Changes in taste
One of the first early signs of pregnancy can be a change in taste and a heightened sense of smell.
Mum Lisa agrees, "I had a constant metallic taste in my mouth right from the start."
Sinead says, "I went off tea, I couldn't even stand the smell of it."
Scents that were fine pre-pregnancy can now make you gag.
You may start having cravings for particular foods or even non-foods. Newspaper, ice and loo roll are quite common cravings. It often seems to be the texture that attracts pregnant women.
Like with PMS our moods are often governed by hormones and when you become pregnant they go into overdrive. You may feel more emotional and teary.
Also the whole idea of being pregnant can be pretty daunting. You may be stressed and worried about the whole idea of becoming a parent and about how you will cope.
Being tired and feeling sick can also affect your moods so try to get some rest when you can and eat small snacks to keep your energy levels up.
Cramping and spotting
Slight cramping or having a show of blood, starting a little earlier than you expect your period may be a sign that the fertilised egg is getting attached in the uterus.
Implantation spotting or cramping can be a sign that the embryo has implanted on the wall of the uterus says Emma author of 'Fertility to Family', "This can also cause a milky discharge, long after the mid cycle secretions have passed."