Thoughts?

Im not sure where to post this but I have a question. When I got pregnant with baby#1 he was a surprise I thought I was only 3 days late when I took the test and it was a faint line positive. When I went to the doctor she said I wasn't as far along as I should be based off my LMP she told me I must have gotten pregnant later in my cycle then normal. With baby #2 I had to use clomid for 3 months to convince. Now I'm 2 days late for my cycle im nauseous and have cramps but I have taken 3 tests and they all say negative. Based off glow I should be 16DPO right now is it possible that I just ovulated late again since I'm not taking clomid right now? Has anyone else had this happen am I out this month? I'm so confused. Any advice is greatly appreciated TIA!