My last period was 23rd of april 2012. i have sex april28 to guy1 and april29 to may 7 to guy2. who is the father. i am 25 weeks pregnant now.?

To close to know: Early dating based on last menstrual period is not specific enough to be sure of a conception date. If you get further along & an ultrasound is done it will likely provide better data & come up with a revised due date. If you look back 1yr from a due date & add 12wks you will have projected conception date. The exposure dates you list are too close together to be sure at this point.