My girlfriend hasnt had her period in over a month but weve taken to pregnancy tests and they both said not pregnant, is she pregnant, what do we do ?

Skipping period ok: If pregnancy test is negative she isn't likely pregnant. Usually we start looking into the cause of not having a period after 3 missed periods. Otherwise it is likely to be hormonal. If she is on birth control pills are hormonal birth control is is totally normal to skip a period while taking these. Some people when they know it is normal prefer it, but if not the pill can be changed.

Missed menses: Skipping a period does not always mean you are pregnant but you should seek further medical advice if you are getting a negative test. Sometimes bloodwork can be done to check. Stress, increased exercise or increase/decreased weight, are other reasons to miss a period but there could also be underlying medical conditions too that should be further evaluated.