In Heat while Nursing?

[Pstarr]

I have a sow nursing. Pigs are 11 days old. This wasn't planned (teaser boar visited her 114 days ago). I don't have in crate just in barn. She was somewhat jumping on me. I sat on her back and her ears went up. She is swollen a little. Is this even possible? Never seen this ever. Thanks

[Darin]

How many pigs is she nursing? It's not uncommon for sows nursing small litters to cycle during lactation, but typically it would happen after 3 weeks of lactation. At 11 days is very uncommon.