Anyone find out they were pregnant later on with their second than they did with their first?

I found out I was pregnant with my 1 year old son 3 days before my period was due. The line was so faint I could hardly see it. I'm 2 days late on my period and took a test yesterday and it was negitive. I had some heavy cramping maybe 4 days ago that went away within an hour and thought I was getting ready to start but I didnt. My boobs also hurt and I'm getting random nausea. I'm not trying to get pregnant either so It would be a big oops.