I was sterilised 15 years ago but am now 10 weeks late for my period and bloating, nausea headaches, could i be pregnant?

Possibly.: Did you have a tubal ligation? "There is a slight risk of becoming pregnant after tubal ligation. This happens to about 5 out of 1,000 women after 1 year. After a total of 5 years following tubal ligation, about 13 out of 1,000 women will have become pregnant." REF: http://www.webmd.com/sex/birth-control/tubal-ligation-and-tubal-implants Take a home pregnancy test to know.

Yes: Run a pregnancy test. Depending upon the type of sterilization done, failure is still possible.

Need more info: Conception, as defined by the generation of a fertilized ovum, occurs within day or so of the sex. However, it takes about 3 weeks for the embryo to make enough HCG to produce 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.