does anyone know why my wife could be bleeding during sex, not musch blood less than a teaspoon, bright red this time, time before pinkish followed by brownish spotting? any help thanks.

Me and my husband had this problem every time we had sex, it was brown spotting. The doctor said no more sex- which sucks, but there are always other ways...
As for the red stuff, that should be taken a little more seriously. I would call a doctor.

Its very normal to have some bleeding after intercourse while you are pregnant. The cervix is more sensitive and engorged. Still make sure you mention it to her dr.