(i Have Asked This Question Before But Trying To Get
Can be hernia or lymph node.
Detailed Answer:
Hello dear, welcome to Ask a doctor service.
I read your query and here is my advice.
First of all I can say that you don't have to worry so much about something that you see only once and then never see it for three days even after coughing, laughing and straining . It us better not to refer to much to Google articles.
Also I don't think there is anything else than a hernia or an enlarged lymph node, that it can be according to the position, in the side of pubic area.
If it is an hernia it can go in while laying down and come out while stranding up, straining, coughing, laughing etc.
I don't think this is something to worry about because if it is hernia it is possible at the beginning and very small that not much of intestine can go out.
Since it is not hurting is not an emergency but if pain starts you should seek medical attention soon.
If it is a lymph node the swelling remains always despite the position. Possibly you can't feel it probably but it's still there.
Hope I have answered the question.
Let me know if I can assist you further.