I left my husband on oct 3rd and started sleeping w someone else within a week. I thought I was pregnant but test came back negative. I had my last full period sept. 17 and I had a one day period oct 15th. I thought nothing of it and nov 12th I had 2 positives and 13th I went to hospital. They seen a yolk sac and my levels were 949. 2 days later I had bloodwork and my levels were 2500. I am trying to figure out about how far along I am and if It sounds like my ex husbands or the new guys

Paternity issues cannot be resolved by simply working out conception, especially when the encounters are so close together.
The ONLY surefire method is a DNA test with all concerned parties AFTER the birth.