Last night oct.19 I had sex with my husband after sex I go to bathroom and I saw a red spotting do I am pregnant please reply to me I need help!

While pregnancy would be possible since you had sex, you wouldn't know it that soon. The spotting is likely from the sex itself. Sometimes there can be some irritation to the cervix that may result in some slight spotting or bleeding afterwards.

You will need to wait and see what happens when you expect your next period to determine if you are pregnant or not.