Was the Feb shed a mid-term shed?
Did you see the ovulation?
What kind of behavior have you noticed with her?
Does she lay on her side a lot?
Does she have a lot of scale seperation?
Does she look really large in the rear half and really skinny in the front half of her body?
Has she gotten more aggressive?
Do you have a temp gun to check her temps?
Has she become more active recently?
Do you have an approximate date that the male lost interest?
If Feb was her POS she's not due yet. I counted 15 weeks from Feb 15th and came up with May 31st for a due date. If that was her mid-term shed she might be past due and ready to drop them any minute. 
BTW sometimes you can think they've ovulated and had a POS when what you really saw was the pre-ovulation swell and a shed. If that happened you might not have noticed her actual ovulation that came later. So what you think was a mid term "might" have been an acutal POS. I made this mistake the last time my girl had babies. I just got lucky and saw the actual ovulation and made note of a new due date.
If you think she's in distress you might want to take her to the vet.