Does tamoxifen cause breast throbbing near DCIS tumor?

In treatment for DCIS breast cancer diagnosed on 1/23/26. Surgery tentatively scheduled for March 25, 2026. I’ve been taking tamoxifen for over a week now & I’m noticing a dull throbbing after I take it in my breast where my encapsulated tumor is. The throb is to the left of my tumor. No other symptoms. I’m calling my care team tomorrow (hopefully they are there on a Sunday). I take my pill in the evening & I don’t know if it will subside tomorrow or not. Still freaking out a bit cuz I live alone and this all scares me. But I’m holding it together the best way I know how to. Lots of laughs and support that I’m grateful for. Anyone else experience this? Thank you.