Had semen on stomach and washed it off using water. no soap. not sure if this water contains sperm & went into/on vagina. chances of pregnancy?

Here are some ...: All the involved events in the process you described are extremely hostile to sperm survival. So, the odd to conceive in you is next to zero - never 100% in real life. Nonetheless, nowadays, HPT has made pregnancy confirmation easier than ever; so, do HPT soon after missing the regularly expected period and repeat it in 1 wk if the 1st is (-) or still in doubt. Of course, seek pro-evaluation...