Do I give up? :(

I am 22 years old, I have been with my partner for 4& half years now. We have been trying to conceive for 2 years. I thought something may be wrong after 6 months so we both went to docs to have tests. Nothing is wrong with either of us. All healthy and normal. I have tracked my cycles and ovulation and fertility dates but still nothing. I took a test 3 days ago and got a really faint positive, and now this morning I have started my AF but really heavy. I just feel like I am about to give up 😥