Thank you for putting up your problem to Healthcare Magic!
You are very strange in you choice.
You should have had some protection if you did not want to get pregnant and at least this should have practised with the guy who was not supposed to father the child.
Getting pregnant deliberately and then worring/abortion
are not safe.
Changing partners so casually can lead to serious STDs.
If it is guy A then hCG
levels must have been be low and chances of blighted ovum/ectopic pregnancy
are high and it is very risky so get an Trans-vaginal Ultrasound
to rule out any risk.
If it is guy B then the levels of hCG should be raising to doubles almost other day for normal pregnancy.
If the levels are not appropriate then you will need the Trans-vaginal Ultrasound to rule out the risk.
You need to start the treatment after consulting your gynecologist.
I hope this information would be both informative and helpful for you