Maybe I'm paranoid, but I'd like other opinions. I'm embarrassed to see a doctor

Hi,

I know this story will sound dumb, but I'm still worried.

I've never had 'sex-sex' (aka, no penis), however, my boyfriend (now ex) has fingered me on a few occasions.  Sometimes before, he would have pre-cum and sometimes semen on his hands that he always wiped off on a towel.  In hind sight, I'm not 100% positive he didn't have any semen on his fingers. 

The times this happened where mid-October, early November, and early-December.

After the early-December incident, I decided I wasn't thrilled with the hygiene of the fingering and took Plan B abt 18 hours after the incident.  About a week after I took it, I had 3 days of heavy-heavy bleeding, along with my regularly scheduled period that happened about 2 weeks after that.

I've continually had my period--it's heavy and comes regularly.  In the meantime, I've lost a few pounds, and my stomach is flat.  So, basically, normal, yes?

However, as of lately, I've had a drastic (I'm talking every 30 minutes) need to urinate.  Also, I feel like light pressure on my stomach--not painful, just that I can feel it.  And lastly, not to brag (really, I'm an A cup at 19, so I don't have much haha) but my breasts seem... fuller?  A month ago, I had strange, non itchy rashes that have thankfully vanished.

Scariest of all, my first period after the October instance came about a week late; however, it did come, after I drank tons and tons of parsley tea and gorged on vitamin C.

I've taken at-home pregnancy tests in late October, mid-November,  late November, and late December (I had ceased sexual activities for almost a month), and they're all negative.  My cycle's about every 23 days, 7 days of oh-so-heavy bleeding.

Maybe I'm paranoid, but I'd like other opinions.  I'm in university and I CANNOT. have a kid.  I'm embarrassed to see a doctor (I'm out of state, and don't know where to go).  I'm rather irrationally scared and don't know what to do.  Maybe I should take a blood test?  Would that help?  Or do I need an ultrasound?  Where do you even get those??? What do you think?