After sex do you...?

Now this may be a little weird, but after my husband and I have sex I get up to clean myself. 
​Now my question is since we are trying to conceive, am I supposed to stay laying down, on my head (my mother told me to do this), ect... Or is it okay to get up and use the bathroom?
​We have been trying for a few years and I'm not sure if this is the problem or something else, I have heard people say different things about this but am just not sure? 
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