Late coming to this thread. She certainly looks like she's in pig. When was she with the boar/in season last? Could be she just wasn't ready when her mate was served, so could well be three weeks later.
She does, doesn't she! Margot came into season on the 25th Feb and we popped the boar in with her that day - she was more than welcoming

They bonked for two whole days! People passing the field (frequent dog-walking route) were embarrassed at what they saw, apparently! Lady P came into season 9 days later, and enjoyed a less rigorous seeing-to by the Mighty Raj. We kept Raj in the field with them for another month, just to be sure, but there was no 'activity' on the followign 'due' dates, so we thought they must have both taken the first time.
Anyway, Lady P is about to burst (due date is this coming Friday) and is also in some discomfort. We think it is her back - maybe sciatica

So the sooner she pods, the better.
Margot continues to look sometimes very pregnant, sometimes not at all... So we will just have to wait and see! I can see now why people invest in scanners. It is a long time to wait for no fruit.