Cramping and Spotting During First Chemotherapy Treatment?

Hi! Has anyone experienced cramping similar to period cramps and spotting during chemotherapy? I've just had my first neoadjuvant treatment today and was cramping during treatment and had spotting when it was done. I've just been diagnosed with triple negative invasive ductal carcinoma of the left breast two weeks ago. I've had all my scans, ultrasounds, lab work, and port placement surgery done over the past two weeks, which I believe took a toll on my body. Today, I started chemotherapy. The plan is to do six months of chemo and then tumor resection because it is quite large. My chemo treatment today consisted of the pre-meds (benadryl included in this) along with Keytruda, carboplatin and taxol. I've been experiencing really bad stomach cramping that feels like period cramps. These started about 2 hours into my infusion appointment. When I went to the bathroom before I left the infusion center, I had vaginal spotting with pinkish red blood. My period just finished 6 days ago, so I don't think it's my period again. Has anyone ever experienced that? Thanks a ton for any info that anyone can share. I am 44 and no one in my family both sides have had cancer and I personally do not know anyone who has gone through this experience. Thanks