I have no idea what to think

So my ex and i recently broke up, but before we did, we did the deed. Its been two weeks and yesterday i started having really sore breasts, and a headache. Headaches are an everyday thing for me so im use to that, but ive never had sore breasts like this. I took a pregnancy test just to make sure, and it came back negative. This morning i took two more and i got a negative and a positive. Im on the implenon , and have super iregular periods, and i havent had mine (was suppose to start on the 4th of july). This is pretty common for me.

I read that wearing the wrong sized bras can cause breast pain, and i feel like that could make sense since i always have a bra on(all day and most nights), but thats nothing new. I don't know if i should just see if it gets better, or if i should be worried? What do you think?