I have a 18 month old boy and needed help conceving, they said there is no reason why I can't do it naturally as long as I do it soon after baby born, as I have endometriosis.

Well we have decided to try if it happen it happens if it doesn't I still have a beautiful son, so I'm now 4 days late have a sick feeling since Sunday, trapped wind, tired but maybe due to work and having my son to look after, I have a runny nose for an hour each morning, and feel dizzy every now n then, feel hot, I never usually use the toilet at work but find my self using it twice a day on average, I have taken a test 2 day late at 21.00 and came back negative with clear blue digital. I got my hopes up now about being pregnant and going to re test tomorrow morning to see but looking to see if any one else has had this and not been pregnant, sorry for long post xxx