Brock, I doubt the sows will be in heat until Mid June. We are usually around that time with the rut and this year is really late. I would guess as far as the sow with three cubs, that if any other bears show up, she would leave, due to the threat to her cubs. If he is bedded in the area, he would be checking the bait if not eating from it. two days with no picks tells me that he was moving through, or it might have been the female with the three cubs (but the cubs were out of site?
I have talked to several other hunters and they saw a big slow down this weekend also. Likely due to the cold weather (no sun to heat the bait, or some redenning took place. We are still ice fishing on three feet of ice. A guy I was talking to drove his truck on the lake to ice fish this weekend (maybe crazy but happened).
We had a really cold weekend, so I'm hoping that is what the slow down is from.