Waiting on cycle to start FET protocol

Just seeing if anyone has had the similar issue. I've had 3 prior FET protocols but the lining didnt look good or what not and we had to cancel the transfer. In January we getting ready to start a different protocol and my cycle didnt start and blood work showed that I didnt ovulate. So they said let's wait until natural cycle the next month. February came and I had light spotting and again my cycle didnt start. Went for blood work last Thursday and results came back that I did ovulate and I should start my cycle soon. Until today nothing....I've never missed a period once let alone two times now. I'm so worried what happened. Anyone else missed their cycles during FET protocols? Thank you!!