Either way, the three of you need to have some serious discussions and soon. Omari and you will be trying to raise a child together and that is impossible to do if you aren't having any contact or even limited contact. Part of becoming a parent is being involved in the pregnancy (if possible) and lets face it women tend to need way more attention when we are pregnant.
Who's idea was it to cut sexual relations with Mark? If Omari wanted to keep him in his life, I don't see how this was helpful.