Thanks for the query.
In your age group, it is generally seen that the menses may get irregular due to immaturity of hormonal levels and hence the possible delay. If you have had regular menses earlier , and then when you are 2 months late with the pregnancy test negative, then you need evaluation with a hormonal profile and an ultrasound pelvis. If the scans and hormonal profile is insignificant, then based on the endometrial thickness, which if more than 10mm now, you can be given a withdrawal bleed with progesterones to resume your menses.
However, with the premenstrual symptoms that you are experiencing, it is suggested that you should wait for a few more days to allow natural initiation or onset of menses.
I hope I have answered your query.
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