Having gastritis often after unprotected sex, does this mean pregnancy?

Gastritis and pregnancy are different entities. Once pregnancy is ruled in or out, gastritis has to be addressed properly with the help of the family physician.

Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.