My period never came

I'm new to this app, but not to fertility tracking. I've used a couple different ones the last 7 months since my boyfriend and I decided to have a baby. I have put on weight over the last 8 months and I believe it has caused my period to stop. 6 months of tracking and I thought we had actually conceived this time when my period was late. 5 negative HPTs over the course of 2 weeks and then a blood test at my doctor's office confirmed that I was most definitely not pregnant. I feel so defeated. It's been a month. A month of cramping and pms and still nothing.