I'm so sorry for your loss.
It sounds like your new OB is taking all the necessary steps toward getting you ready for another pregnancy. Has it been suggested that you consult with a doctor of Maternal Fetal Medicine (MFM)? Given your loss and possible early onset of preeclampsia, consulting with an MFM and establishing a relationship between the MFM and your OB would likely be beneficial for you. BP medication should have no impact (that I'm aware of) on the success of conceiving. However, getting your bp under control and managed prior to getting pregnant will definitely be beneficial to you. Again, I am so sorry for what you've experienced and such terrible loss.
Heather (PAI-1 4G/4G) mama to:
Nicolas Edison (6/2004) 36 weeks, PE, HELLP, and placental abruption
Ella Amelia (3/2007) 37 weeks, lovenox, PE-free
Oliver Lyon (1/2011) 37 weeks, lovenox, PE-free
Milo Mason (2/2014) 39 weeks PE-free