Determining paternity based solely on dates can be challenging, but it is possible to get an estimate. If you had your period or experienced implantation bleeding on April 4th, it is likely that conception occurred around that time. However, keep in mind that sperm can survive inside the female reproductive system for up to five days. The best way to determine paternity accurately is through DNA testing after the baby is born. This will provide conclusive results and eliminate any doubts or uncertainties. It's important to communicate openly with both potential fathers about your situation and discuss their willingness to undergo DNA testing if necessary. Remember, seeking advice without judgment is essential, so reach out to healthcare professionals or support organizations who can provide guidance and support during this process.