Question about being late

So I just wanna see if anyone has experienced this or any advice. I have an average day cycle of 35 days. My last period was Oct. 20th. I was due nov. 24th so I tested the 26th (2days late) negative then again on 30th which was 6 days late n bfn again. As for symptoms on cd 15,16 n 17 I had light spotting which I have never had figure probably o'd. We bd'd on cd 18. Then on cd 33,34,35 I had bad af cramps and thought for sure it was coming. My nipples were really sore but now just tender. Yesterday morning I checked my cervix and there was light brown/pink on my tip of finger. Thought af was def on her way but nope and checked cervix again this morning and nothing but creamy cm. Thanks for any input on this. Just never been this late except when pg and never had mid-cycle spotting.