Feeling nauseous in the mornings could be a sign of pregnancy, if you have reason to think that you might be pregnant. (You should of course see your doctor if you are concerned about it, or if the nausea could be due to some other cause.)
The most well-known signs of pregnancy are as follows:
- Obviously, a positive home pregnancy test - particularly if you've waited until the first day of a missed period to carry out the test. If you see a blue line in the test window (similar to the one above), then you should see your doctor to confirm that you are pregnant.
- If you usually have regular periods, often one of the first signs of pregnancy is a missed period, so if this applies to you, you should probably take a home pregnancy test.
- One of the very earliest signs, in my experience, is that the veins in the breasts become more visible. They can also become tender to the touch, and the areolas (which are the areas surrounding the nipples) can darken, too, though this is not always the case.
- Fatigue. If you're feeling exhausted for no apparent reason, this too can be a sign of early pregnancy, and is due to the hormonal changes your body is experiencing.
- Frequent urination. Once the embryo implants, you may find that you have to go to the toilet more often.
- You can see spotting, or feel cramps in the early stages of pregnancy, too - which can be very confusing as you can assume that your period is starting. This is apparently caused by the egg burrowing into the lining of the womb.
- Food cravings. These can occur surprisingly early in pregnancy, so if you suddenly crave a food that you normally wouldn't, this too could be a sign of pregnancy.
- An altered sense of taste. Sometimes this can take the form of a metallic taste in the mouth, or you may suddenly find the taste of things like coffee very unpleasant.
- Morning sickness. Usually morning sickness doesn't kick in until a few weeks after conception, but it can start as few as 2-3 days afterwards. It doesn't only occur in the mornings, either, but can happen at any time of the day or night.
There's a very helpful video here, which talks about normal signs of pregnancy, as well as a detailed list of symptoms, on the UK's NHS website.
If I were you, I'd take a test - if only to put your mind at rest!