Hi everyone - new to Mumsnet...sorry for the long post with way TMI, there's just so much I'm confused about and hope it's all linked or that there's a simple explanation so want to include everything!
I was hoping for a bit of advice/reassurance/a reality check...
A bit about me - I'm 26, my OH is 38, trying for first baby, never been pregnant before, never been on birth control, my OH and I have been TTC for 6 cycles, I've been tracking my bbt and have a regular cycle of 28 days, with ovulation around day 17 with my bbt dropping down to pre-ovulation temps the day before AF starts. Usually very heavy (heavy bleeding starts day 2 or 3), 5 day period and has been like this since I can remember.
Since TTC my period has been unusually unusual.
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Four months ago I had the biggest clots I'd ever seen (even bigger than google images results 
)
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For the last few months it has started a couple of days early with very light spotting the first few days (which I thought could've been implantation bleeding, until AF started in full swing).
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This month cystitis came out of nowhere just before AF and I started light spotting again day 26 (thought it could have been due to cystitis??) Although it's much lighter now, I've been bleeding for 8 days and cystitis symptoms have come back again today. Also, my bbt never dropped like usual and has actually started increasing the last few days - could this be down to cystitis too?
Now at 18DPO and for the past 48 hours I've had achey boobs, mild cramping, emotions all over the place and have lost my appetite for certain foods (completely not interested in sweet foods - weird for me, and finding everything way too salty). I know it's very unlikely that I'm pregnant given the fact that I've had my period 
, but given the anomalies and symptoms, thought I'd check with you guys to see what you think I should do 
...
I bought cystitis meds today to take this evening but was a bit worried because it says not to take if you could be pregnant (can't believe I'm even considering the possibilty of pregnancy while on the 8th day of bleeding).
I've never done a pregnancy test, but do you think it's worth doing one now or should I just forget about it and wait until the cystits meds kick in and all of this (inevitably) disappears?
A few things I'm worried about - early periods are making my already shortish (11 days) luteal phase even shorter (9 days), and is the light spotting a few days before AF is due to start a sign of fertilisation and implantation happening but soon becoming non-viable for some reason?
Going to book in with my doctor for a check up as soon as this is all over, but just wanted to hear from others who are going through the same thing or have an idea of what might be wrong in the meantime.
Could I be having a cryptic pregnancy, or am I going mad!!?
Thanks so much everyone!