What's going on?

July 10th I stopped taking my birth control after being on it for a year and  half. I started taking prenatal vitamins because I was told it would help become pregnant. It's been 2 months now and my fiancé and I have been ttc. I've been experiencing a lot of neausea, indegestion, cravings, headaches, hot flashes, and recently my nipples have become very tender to the touch. Most of these I normally don't have. I'm typically a very cold person so being hot is very out of the norm. Also I've experienced tender breast before my period but never nipples. 
Here's were I'm confused.... I have not received my period and I've always been an on schedule kind if girl. I took a test this morning and it came back negative, my fiancé thinks it's lying haha.... Can I get some feed back and or advice :(