Any advice would be nice

My boyfriend an I were TTC and we picked the night before Valentine's Day to do it. So 3 1/2 weeks later I test I took one yesterday and one this morning and their both negative. I've missed my peroid, was spotting for like a week after and cramps with it. Implantation is what I believe it's called. But I really wanted a baby and my time didn't come 😪