Welcome to HCM,
You should have mentioned the due date and date of your previous menstrual period.
Symptoms mentioned by you can be present just before menstrual period also.
It seems that you had your previous period before 6/20.
In a regular menstrual cycle of 28 days, ovulation occurs generally on the 14th day of previous period. Thus if you had your previous period about 14 days prior to 6/20, you might be pregnant.
And the best way is to confirm or exclude it by pregnancy
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With good wishes,