Help me

Biannca

Me and my boyfriend have been trying to have a baby but every time we try the test come back negative each time. I haven’t been on my period since my birthday aug 16th the last time I actually got my period was the middle of Oct started right after sex my blood was light pink and my flow was light on the second day my flow proceeded to be heavier my period lasted up to four days in total since then I haven’t been on my period. Lately my breast and nipples have been sore to the touch today I got my period but it was different this time light pink yes but it stopped bleeding at 12pm my stomachs been cramping a lot since it stopped please tell me what can I do or what needs to be done..