On-again, off-again babydaddy Gary Shirley may be shedding the pounds, but it looks like explosive Amber Portwood may be packing them on in the near future if the rumors are true. Sources are telling Radaronline.com that the 20-year-old reality star has a bun in the oven. Unfortunately, the infamous teen mom has been linked to so many losers lately there's really no way to tell who the baby daddy is. Insiders tell Radaronline.com that Portwood has taken pregnancy tests at least three times over the last few weeks -- and passed all of them with flying colors. An insider tells Radaronline.com, "When Amber tested positive, she decided to go to a local clinic to have a doctor tell her once and for all if she is expecting. It's confusing because Amber is telling people that the doctor said the test was negative, even though the home pregnancy tests came back positive, and there were a number of them too." Adding fuel to the fertile fires is the fact that Portwood was spotted at the medical clinic. Yet she maintains she was just there "to get birth control." It's hard to say whether she's in a state of denial or not. But her most recent fling, tattoo artist Adam Dockery, has told his friends that if she's got a bun in the oven, it's definitely his. He said last week, "She's telling me it was negative, but I'm not so sure if I'm believing her though."Portwood is currently back together with baby daddy numero uno Shirley. This past December, Portwood was plagued by pregnancy rumors. Back then she said, "I'm working hard to be the best mom to my daughter. I have no plans to have more kids anytime soon."