Idk whats going on with my body

Hello everyone!!

Background:

I am a very petite gal and my diet is pretty off and on. I know it's not the healthiest thing but I have periods of time where I eat lots, or I have periods of time where I am working a ton and I just don't think to eat. I get stressed out and have bit of anxiety. I am not on any sort of birth control and I also am horrible at keeping track of my period.. sometimes it feels like I don't get it for a long time. It comes when it comes. Recently however, I have started taking my Basal Temperature because I am tired of not being knowledgable about my body and whats going on.

ANYWAYS:

I have no idea when I had my period in November.
In December my boyfriend was in town and of course.. we had sex. I usually do NOT let him *ya know* in me because I don't keep track of when Im fertile and when I am not... but this time It happened four times. I know its irresponsible but I thought there was no way because I thought my Ovulation would have occurred a long time ago... since I hadn't remembered when my last period was....

It was the 11th-14th. He left the 15th. LITERALLY days after he left I started getting period like symptoms... tender breasts, tight and bloated stomach, creamy white cervical fluid. Thought my period must be coming. Then on the 20th I was at work and experienced TWO stabs in my left side of my stomach but it only lasted a minute. It was so painful though I had to sit down. I freaked out and thought if it were to continue I would have to leave work. THEN the 21st, I woke up with quite a bit of blood.. I bled for two days. It stopped completely. and now I have just been spotting.

Usually I NEVER get cramps like that before a period and usually my periods blood flow is different.. I always end my period with one blood clot usually.Thats when I know that it is over. But this time everything was completely different.

Now though my breasts don't hurt. Im very confused as to what is going on with me. HELP