Just started tanning and acquired some new freckles- should i get them checked out for melanoma?

I've just started tanning for a special event in a couple weeks but just wanted to be cautious about a few new little freckles that have shown up under my thighs (an area where the sun doesn't usually shine). I'm fair skinned but I don't have any moles, any history of skin cancer in my family, red hair, and I've never had a really bad sunburn- just a fairly large amount of freckles. But still, is this something I should be really concerned about and contact a doctor or is it normal? I only go for 8-10 minutes and have only been three times so far. After this big event I don't really plan on tanning on a regular basis, and I haven't before.