I don't understand!!! 😩😩😩

3 weeks late as of this past Sunday, negative blood test and negative hpt this morning but honestly "feel pregnant". I know this isn't all in my head. My boobs are killing me, excessive cm, headaches/lightheadedness and fiancé says I've been too emotional lately. Same was when I found out I was expecting our son. It took me until I was 15 days late to get a positive with him but now I'm 23 days late-- it's almost time for my next period. OB/GYNO dr wants me to start a new pack of bc pills to make me start but I'm so nervous to take them. What would y'all do?