Very sensitive boobs

Hi everyone. I have been TTC for about 5 months now and this cycle has been very weird. I'm on cycle day 17 of 25 (I have a short cycle) and normally my boobs get really sore from PMS around cycle day 21 but they have been so sensitive and sore from last night and all today. It is worse than normal and very early. I have an extremely regular cycle and have tested positive for ovulation each cycle we have been trying. I heard this could be due to ovulation but I ovulated about 5 days ago. I am no expert on this type of stuff so what are your thoughts on this? Thank you so much for your responses.