Used tampon one got stuck in her vagina for maybe 2 weeks she been having unprotected sex during that time..cud da sperm get da egg? or infection possible?

Probably neither: If you had an infection, you would be experiencing severe pain, fever and vaginal drainage. It is also unlikely that your are pregnant due to the obstructive nature of the tampon.

Yes: If you think you may be pregnant you should wait until you have missed a period and then get a home test kit and use it on a first morning voided urine. If you think you are infected because of discharge, pain, fever, or anything else go and see a doctor asap. Hopefully the tampon is now out. If not, go and see a doctor. Good luck.

See DR-TSS: Toxic shock syndrome-tss, a serious infection form a tampon being "stuck" or left in the vagina for too long is a very serious medical conditions and infection that needs to be treated asap by a dr. Best for you to get a gyn dr. To evaluate you. Best wishes.