Does it reduce the chances of falling pregnant if?

First of all i just want to say sorry in advance if my question seems too detailed.Me & my partner have been trying to concieve for about 1 1/2 years now & still haven't been succesful.I have another child from my ex partner & i thought once you have 1 child it should be easy to fall pregnant with another.When we have & after he s i've been keeping my backside raised for 45min-1hr but most of the time the 'stuff ' leaks out.Is this the reason why i'm not falling pregnant or does it decrease my chances? Please help,really need to know.Thankyou in advance for answering.