I am 18 days after the intercourse and 2 day after my period was due. i took a bfp early pregnancy test strips this morning can i trust the result?

If the test was: ...positive, you can "trust" the result. If the test was negative, then, if you don't get your period in another few days, you should repeat the test at the same time of the day as you did this morning. If you still don't trust the results, you should make an appointment with your gyno or family practice doctor. Best wishes. Dr. Anne.