i'm 11 weeks pregnant and have developed a swelling under my arm, there is not really a lump. It is tender sometimes. My dr checked it out and didnt know what it was. He said he didnt think it was anything nasty but to keep an eye on it. i have to go back in just over a week and he said if it has not gone by then he will refer me to a surgeon. Im so scared. I'm not too well with this pregnancy....vomiting alot, but im really worried about this swelling. It hasnt gone . i was wondering if it is something to do with being pregnant. Hope someone can advise me please.