So I stopped my birth control pill at the end of sept. ME and my boyfriend are regularly sexually active. I started my period on oct 27th. But I cheated on him on nov.14th. How stupid of me? I took a pregnancy test on nov. 24th it was negative. I felt like I was going to start my period on the 27th 28th I spotted like a little in the morning and had cramps. I took a test on the 6th of dec and its pos. if you go by the ovulation calculators it says I conceived between he 7th and the 12th and the due date calculator says I'm 6wks. Is it a possibility it's the other guys?

You won't know for sure who's it is until the baby is born and you get a paternaty test done.
Does your boyfriend know that your baby might possibly be his? My advice to you is you should tell him if he doesn't know.

There is truly no way to tell until a paternity test is done after the birth of the baby.

When you go to your first prenatal visit, your doctor can give you an approximate date of conception (much more reliable than the internet) and you may be able to narrow it down from there.

Since you cheated on the 14th... it's really too close to call. In a fertile environment, sperm can live up to 5 days, and conception dates are not always 100% accurate.

The only way you will know 100% is by getting a DNA test done once the baby is born.