It is very hard to say especially because you suffer from PCOS and are experiencing hormonal imbalance, so you never can tell what is what.
Did your doctor give you a hormonal shot in order to get your period or had an ultrasound done?
The extreme cramps could be
PMS, excessive
estrogen presence and it could be miscarriage but in that case you would probably experience light red bleeding.
Of course there is an exception to everything and things don’t work the same in every women, and that is exactly why it is impossible to say more without having an examination.
Breast tenderness is again not saying much as it could be both PMS and beginning of the pregnancy. Breast tenderness during pregnancy is a very common thing. It is often one of the very first pregnancy signs. The tenderness usually begins between the fourth and sixth week of pregnancy, and may continue through the first trimester.
Any news from your doctor yet?
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