The most common symptoms of gastritis include: (13) 1  burning sensations in or above the stomach/abdomen, especially around the time of eating. 2  stomachaches or pains. 3  nausea or vomiting. 4  stomach bloating. 5  loss of appetite, feeling very full quickly and possibly experiencing changes in weight. 6  hiccups and burping.
For the most part, taking birth control while pregnant will not cause your baby any harm. This is especially true if you have been using birth control pills early in your pregnancy. But, if you have an IUD and become pregnant, you may be at risk for certain pregnancy complications.
So, a missed period is not the best sign to rely on to know if you are pregnant while on birth control pills. Other signs of pregnancy can be more telling. Breast tenderness, for example, is one of the very earliest signs of pregnancy. Increased hormones cause breasts to be sensitive and sore, and often to swell. If you are on birth control pills and your breasts suddenly become sensitive and sore, you may be pregnant.