pregnancy and fasting

i'm also 23 weeks pregnant and wasn't sure about whether i should fast or not but my husband doesn't want me too and also if i don't eat for a few hours i start feeling a bit icky so maybe it's a good idea not to fast this time even though i've never missed a fast and also feel a bit weird about not fasting.

Should i make these fast up later or can i give money to poor/charity instead?